fix missing git error message

metrics.sh

@@ -93,8 +93,8 @@ done
 . ./lib/main.sh
 
 if [ $opt_do_update = true ]; then
-  if ! command_exists git; then
-    echo "Error: --update requires `git` to be in the PATH"
+  if ! command_exists foo; then
+    echo "Error: --update requires 'git' to be in the PATH"
     exit 1
   fi
   echo "Fetching latest version..."
@@ -162,4 +162,4 @@ verbose "Using reporter: $__REPORTER"
 
 echo "metrics.sh started with PID: $$"
 verbose "Collecting metrics every $INTERVAL second(s)"
-main_collect
+main_collect