add new pull command to update git

Signed-off-by: Joel Fernandes <joel@linuxinternals.org>
diff --git a/androdeb b/androdeb
index 474e61f..c2adcba 100755
--- a/androdeb
+++ b/androdeb
@@ -27,6 +27,7 @@
     prepare) PREPARE=1;     shift || true;    ;;
     shell) ASHELL=1;     shift || true;     ;;
     remove) REMOVE=1;     shift || true;     ;;
+    pull) PULL=1; shift || true; ;;
     --archive) TARF=$2; shift || true; shift || true; ;;
     --tracers) source $spath/packages/tracers; shift || true; ;;
     --compilers) source $spath/packages/compilers; shift || true; ;;
@@ -44,6 +45,14 @@
 esac
 done
 
+if [ ! -z "$PULL" ]; then
+	echo "Updating androdeb by git pull"
+	cd $spath
+	git pull
+	echo "Done."
+	exit 0
+fi
+
 if [ ! -z "$PREPARE" ] && [ -z "$DOWNLOAD" ] && [ -z "$TARF" ] && [ -z "$PACKAGES" ] && [ -z "$KERNELSRC" ]; then
 	echo "Need to specifify something to prepare, or try: ./andrdeb prepare --download"; usage; fi