improve update-readability script

clone-readability.sh

@@ -1,6 +0,0 @@
-#!/bin/bash
-rm -rfv readability
-git clone https://github.com/mozilla/readability.git
-rm -rfv readability/.git
-git add readability
-git commit -m "Update readability from github"

update-readability.sh

@@ -0,0 +1,7 @@
+#!/bin/sh -e
+if [ -d readability ]; then
+    cd readability
+    git pull
+else
+    git clone https://github.com/mozilla/readability
+fi