Remove peerDependencies from package.json

Issue codemirror/dev#1479

Author: marijnh

package.json

@@ -31,12 +31,6 @@
     "@codemirror/view": "^6.17.0",
     "@lezer/common": "^1.0.0"
   },
-  "peerDependencies": {
-    "@codemirror/language": "^6.0.0",
-    "@codemirror/state": "^6.0.0",
-    "@codemirror/view": "^6.0.0",
-    "@lezer/common": "^1.0.0"
-  },
   "devDependencies": {
     "@codemirror/buildhelper": "^1.0.0"
   },