CAHNGELOG.md in renc-0.2.0 vs CAHNGELOG.md in renc-1.0.0

@@ -1,8 +1,17 @@
+# v1.0.0
+- base method change from singleton_method to instance_method.
+- renc method is implemented.
+- enc method is deprecated.
+- required Ruby version is change to over 2.2.4.
+  - gemspec: `spec.required_ruby_version = '>= 2.2.4'`
+    - maybe, be able to run on `version >= 2.0.0`.
+  - Travis CI: 2.2.4, 2.3.0
+
 # v0.2.0
 - implement base features.
 
 # v0.1.0
 - sorry, this version is dummy.