Update CHANGELOG.md for changes in 0.19.2, 0.19.3 and 0.19.4

CHANGELOG.md

@@ -1,3 +1,24 @@
+## 0.19.4, release 2016-11-28
+* Rename `Thor::Base#thor_reserved_word?` to `#is_thor_reserved_word?`
+
+## 0.19.3, release 2016-11-27
+* Output a warning instead of raising an exception when a default option value doesn't match its specified type
+
+## 0.19.2, release 2016-11-26
+* Fix bug with handling of colors passed to `ask` (and methods like `yes?` and `no?` which it underpins)
+* Allow numeric arguments to be negative
+* Ensure that default option values are of the specified type (e.g. you can't specify `"foo"` as the default for a numeric option), but make symbols and strings interchangeable
+* Add `Thor::Shell::Basic#indent` method for intending output
+* Fix `remove_command` for an inherited command (see #451)
+* Allow hash arguments to only have each key provided once (see #455)
+* Allow commands to disable class options, for instance for "help" commands (see #363)
+* Do not generate a negative option (`--no-no-foo`) for already negative boolean options (`--no-foo`)
+* Improve compatibility of `Thor::CoreExt::HashWithIndifferentAccess` with Ruby standard library `Hash`
+* Allow specifying a custom binding for template evaluation (e.g. `#key?` and `#fetch`)
+* Fix support for subcommand-specific "help"s
+* Use a string buffer when handling ERB for Ruby 2.3 compatibility
+* Update dependencies
+
 ## 0.19.1, release 2014-03-24
 * Fix `say` non-String break regression