Merge pull request #2111 from pre-commit/silence

silence the output of `command -v`

pre_commit/resources/hook-tmpl

@@ -12,7 +12,7 @@ ARGS+=(--hook-dir "$HERE" -- "$@")
 
 if [ -x "$INSTALL_PYTHON" ]; then
     exec "$INSTALL_PYTHON" -mpre_commit "${ARGS[@]}"
-elif command -v pre-commit; then
+elif command -v pre-commit > /dev/null; then
     exec pre-commit "${ARGS[@]}"
 else
    echo '`pre-commit` not found.  Did you forget to activate your virtualenv?' 1>&2