update changelog for 1.4

Author: gasche

CHANGELOG.md

@@ -1,27 +1,40 @@
 Changelog
 =========
 
+1.4
+---
+
+  * OCaml 4.06 support
+    #19
+    (Gabriel Scherer)
+
 1.3
 ---
 
   * Also allow extraction of module types from the current module's interface file.
+    #12
+    (Xavier Guérin)
 
 1.2
 ---
 
   * Allow extracting types from the current module's interface file.
+    (Xavier Guérin)
 
 1.1
 ---
 
   * OCaml 4.03 support.
+    (whitequark)
 
 1.0
 ---
 
   * Allow extracting types from module types.
+    (whitequark)
 
 0.1
 ---
 
   * Initial release.
+    (whitequark)