share v0.23.0 (2021-02-05)

This release bring major refactoring to package memfs to allow embedding two
or more directories in single package.

The minimum Go version is increased to 1.14.

===  Breaking changes

*  memfs: refactoring, allow multiple instances of memfs in single package

   Previously, the generated Go code from memfs can be used only once
   on the package that use it.  For example, if we have two instances of
   memfs.MemFS and both of them call GoGenerate(), when we load them back
   again only the last one will be active and set the global variable
   memfs.GeneratedPathNode.

   This changes refactoring on how we use memfs by storing the
   generated path node into variable that is defined by user and pass
   them to New Options.

*  memfs: remove field WithContent

   The field WithContent is not necessary if we set MaxFileSize to negative
   value.

*  http: embed the memfs.Options into ServerOptions

   This is to minimize duplicate on fields names and give clear distinction
   between options for Server and options for serving files on memory using
   memfs.

*  io: embed the memfs.Options into DirWatcher

   This is to minimize duplicate configuration between DirWatcher and
   memfs, and to allow clear distinction between which options that
   affect the directory tree and options for DirWatcher.

*  memfs: allow AddFile to set internal path

   Previously, AddFile set the internal path equal to path of file to be
   included.  This may cause conflict if the file is already included
   due to the same sys path but different internal path.

   This commit add parameter internalPath to set custom internal path in
   the memfs map.

*  memfs: refactoring Go generate code to use memfs.MemFS instance

   Instead of using memfs.PathNode, which is confusing for new user
   (what is PathNode?), we actually can use memfs.MemFS instance.

   This effect on how we use memfs in http package.

*  dns: change the SOA field in ZoneFile to non-pointer

   The reason we use pointer for SOA record is so we can save them only
   if its not nil.  A nil SOA record cause the generated JSON become "null"
   and this is make the consumer of ZoneFile do more work, checking for the
   null and initialize it when required.

   This changes, make the SOA record to non-nil and we save the record only
   if the MName field is not empty.

*  dns: replace master word with zone

   This is for consistency for type and variable names.

*  sql: sort returned names on ExtractSQLFields sorted in ascending

   This is to make sure that any test that use the package always
   predictable.

   While at it, add paramter to change placeholder on ExtractSQLFields.

===  New features

*  http: add method Post on client

   The Post method send the POST request to path without setting
   "Content-Type".

*  lib/clise: new package that implement circular slice

   A circular slice is a slice that have fixed size.
   An append to slice that has reached its length will overwrite and start
   again from index 0.

   For example, a clise with size 5,

     c := clise.New(5)
     c.Push(1, 2, 3, 4, 5)
     fmt.Printf("%v\n", c.Slice()) // [1 2 3 4 5]

   If we push another item, it will overwrite the first index,

     c.Push(6)
     fmt.Printf("%v\n", c.Slice()) // [6 2 3 4 5]

   See the examples for usage of the package.

*  time: add function UnixMicro that return UNIX time in micro seconds

*  api/slack: simple API for sending message to Slack using only
   standard packages.

*  runes: add function to inverse the slice of rune

   The Inverse function reverse the order of slice of rune without
   allocating another slice.

*  big: add method Humanize

   The Humanize method return the r as string with custom thousand and
   decimal separator.

*  big: add method to round fraction to nearest non-zero value

   The RoundNearestFraction does not require precision parameter, like in
   other rounds function, but it figure it out based on the last non-zero
   value from fraction.

===  Enhancements

*  dns: change the error messages on ResourceRecord initAndInitialize

   This change make the error message more readable and understandable by
   consumer

*  dns: add method to get list of non-local caches in the Server

   The CachesLRU method return the list of non-local caches ordered by
   the least recently used.

   This changes affect the answer type which must be exported, including
   most of its fields, so consumer can access it.

===  Bug fixes

*  sql: check nil on Migrate parameter "fs" using reflect.IsNil

   If we pass nil pointer of type to fs, the if condition will not true
   and this cause panic because fs is not nil.

*  http: fix the package documentation

   The RegisterXxx methods on Server has been replaced with single method,
   RegisterEndpoint.

*  dns: fix saving the TXT record file on zone file

   The TXT record value must be wrapped with quote when stored on zone
   file.