CHANGELOG.md in embulk-formatter-single_value-0.1.2 vs CHANGELOG.md in embulk-formatter-single_value-0.2.0

@@ -1,4 +1,10 @@
+# 0.2.0 (2016-02-22)
+
+Changes:
+
+* Rename message\_key option to column\_name option
+
 # 0.1.2 (2016-02-20)
 
 Fixes:
 
 * Fix gemspec