Update documentation

README.md

 
     curl -ksS https://raw.github.com/ymattw/cdiff/master/src/cdiff.py > ~/bin/cdiff
     chmod +x ~/bin/cdiff
-    
+
 ## Usage
-    
+
 Just give it a diff (patch) file or pipe a diff to it.  Use option `-s` for
 side-by-side view, and option `-w N` to set a text width other than default
 `80`.  See examples below
     cdiff foo.patch             # view incremental, colored udiff
     cdiff foo.patch -s          # view in side by side mode
     cdiff foo.patch -s -w 90    # use text width 90 other than default 80
-    
-Read diff from svn:
 
-    svn diff | cdiff
-    svn diff | cdiff -s
-    svn diff | cdiff -s -w 90
-    
-Read diff from git:
+Read diff from svn, git, or hg:
+
+    cdiff
+    cdiff -s
+    cdiff -s -w 90
+
+Read diffs in git logs:
 
-    git diff | cdiff -s
     git log -p -2 | cdiff -s
     git show <commit> | cdiff -s