chore: add coverage folder to the npmignore file

BridgeAR · BridgeAR · commit ed28d1ec1d51 · 2018-02-26T23:48:45.000Z
diff --git a/.npmignore b/.npmignore
@@ -1,2 +1,5 @@
 # .npmignore file
 test/
+
+# Coverage directory used by tools like istanbul
+coverage
