Merge pull request #356 from phil-blain/doc-improvements

docs: add 'color.diff.func' color to README

Author: scottchiefbaker

README.md

@@ -38,6 +38,7 @@ git config --global color.diff-highlight.newHighlight "green bold 22"
 
 git config --global color.diff.meta       "11"
 git config --global color.diff.frag       "magenta bold"
+git config --global color.diff.func       "146 bold"
 git config --global color.diff.commit     "yellow bold"
 git config --global color.diff.old        "red bold"
 git config --global color.diff.new        "green bold"