Bump version and update chagelog

Author: fisuda

src/config.xml

@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='UTF-8'?>
-<widget xmlns="http://wirecloud.conwet.fi.upm.es/ns/macdescription/1" vendor="FISUDA" name="json-injector" version="0.1.1">
+<widget xmlns="http://wirecloud.conwet.fi.upm.es/ns/macdescription/1" vendor="FISUDA" name="json-injector" version="0.1.2">
 
     <details>
         <title>Json Injector</title>

src/doc/changelog.md

@@ -1,7 +1,15 @@
-## v0.1.0 [Extra release info, e.g. release date]
+## v0.1.2 (2019-11-16)
 
-Initial version
+- Add save state feature
+- Reduce widget size
+
+
+## v0.1.1 (2019-9-14)
+
+- Fix invalid icon
+- Support WireCloud 1.3
 
-- change 1
-- change 2
-- ...
+
+## v0.1.0 (2019-8-10)
+
+Initial version