update composer keyword

Andrew Mc Cormack · Andrew Mc Cormack · commit 19f56e09e85d · 2017-10-26T15:46:01.000+01:00
diff --git a/composer.json b/composer.json
@@ -5,6 +5,8 @@
     "homepage": "http://github.com/cyber-duck/silverstripe-google-tag-manager",
     "keywords": [
         "silverstripe",
+        "silverstripe 4",
+        "gtm",
         "google tag manager",
         "website tracking",
         "google analytics"
