Add Changelog to docs

Author: lucerion

doc/vim-extract.txt

@@ -11,6 +11,7 @@ CONTENTS                                                          *vim-extract*
 Install                                                   |vim-extract-install|
 Commands                                                 |vim-extract-commands|
 Options                                                   |vim-extract-options|
+Changelog                                               |vim-extract-changelog|
 License                                                   |vim-extract-license|
 
 ===============================================================================
@@ -75,6 +76,12 @@ Append selection to a extract buffer, otherwise clear buffer before extracting
 
 Default: 1
 
+===============================================================================
+CHANGELOG                                               *vim-extract-changelog*
+
+0.1.0 (2015-12-06)
+  First release
+
 ===============================================================================
 LICENSE                                                   *vim-extract-license*