Merge pull request #4109 from zhiyelee/patch-1

add git alias `gcam` -  git commit -am

plugins/git/git.plugin.zsh

@@ -68,6 +68,7 @@ alias gc!='git commit -v --amend'
 alias gca='git commit -v -a'
 alias gca!='git commit -v -a --amend'
 alias gcan!='git commit -v -a -s --no-edit --amend'
+alias gcam='git commit -a -m'
 alias gcb='git checkout -b'
 alias gcf='git config --list'
 alias gcl='git clone --recursive'