Restrict sax versions until we can publish a major

Author: danmactough

package.json

@@ -43,7 +43,7 @@
     "lodash.uniq": "^4.5.0",
     "mri": "^1.1.5",
     "readable-stream": "^2.3.7",
-    "sax": "^1.2.4"
+    "sax": ">=1.2.4 <1.4.4"
   },
   "devDependencies": {
     "eslint": "^6.8.0",