fix #4103: remove opencollective scripts

package.json

@@ -6,9 +6,6 @@
   "directories": {
     "doc": "docs"
   },
-  "dependencies": {
-    "opencollective-postinstall": "^2.0.1"
-  },
   "devDependencies": {
     "babel-cli": "^6.26.0",
     "babel-preset-babili": "^0.1.4",
@@ -20,7 +17,6 @@
     "npm-run-all": "^4.1.5"
   },
   "scripts": {
-    "postinstall": "opencollective-postinstall",
     "lint": "eslint src/bootstrap-table.js src/locale src/extensions/export src/extensions/editable src/extensions/toolbar src/extensions/filter-control src/extensions/cookie",
     "js:build:min": "NODE_ENV=production babel src -d dist -q && find dist -name '*.js' | sed -e 'p;s/.js/.min.js/' | xargs -n2 mv",
     "js:build:base": "babel src -d dist -q",
@@ -58,10 +54,5 @@
       "path": "./node_modules/cz-conventional-changelog"
     }
   },
-  "types": "./index.d.ts",
-  "collective": {
-    "type": "opencollective",
-    "url": "https://opencollective.com/bootstrap-table",
-    "logo": "https://opencollective.com/bootstrap-table/logo.txt"
-  }
+  "types": "./index.d.ts"
 }