chore: pin strip-ansi

Author: aminya

package.json

@@ -27,7 +27,7 @@
     "atom-message-panel": "1.3.1",
     "atom-space-pen-views-plus": "^3.0.4",
     "rimraf": "^3.0.2",
-    "strip-ansi": "^6.0.0",
+    "strip-ansi": "<7.0.0",
     "temp": "^0.9.4",
     "underscore": "^1.13.1",
     "uuid": "^8.3.2"