Remove scrollmonitor

package.json

@@ -12,8 +12,7 @@
     "webpack-cli": "^3.1.0"
   },
   "dependencies": {
-    "intersection-observer": "^0.5.0",
-    "scrollmonitor": "^1.2.4"
+    "intersection-observer": "^0.5.0"
   },
   "scripts": {
     "start": "webpack --watch & browser-sync start -s . -f .",

yarn.lock

@@ -2098,10 +2098,6 @@ schema-utils@^0.4.4, schema-utils@^0.4.5:
     ajv "^6.1.0"
     ajv-keywords "^3.1.0"
 
-scrollmonitor@^1.2.4:
-  version "1.2.4"
-  resolved "https://registry.yarnpkg.com/scrollmonitor/-/scrollmonitor-1.2.4.tgz#823d04cc1574aa3b71de7cc70ef91ebe633344a0"
-
 semver@^5.3.0, semver@^5.5.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"