Upgrade: Use git-changelog-generator v1.2.0

Author: pedroamador

kd.sh

@@ -37,7 +37,7 @@ function assertCommandExist () {
 commandList=(
     commit-validator:0.1.4
     get-next-release-number:1.1.0
-    git-changelog-generator:1.1.2
+    git-changelog-generator:1.2.0
     hello-world:0.2.1
     md2html:1.1.1
     mdline:0.1.0