Update manifest.json

Removed LWRP references from manifest.json.

Packages/manifest.json

@@ -11,9 +11,6 @@
     "com.unity.ide.vscode": "1.0.4",
     "com.unity.package-manager-ui": "2.2.0",
     "com.unity.purchasing": "2.0.6",
-    "com.unity.render-pipelines.core": "file:/Users/rus/Desktop/ScriptableRenderPipeline-2d-staging/com.unity.render-pipelines.core",
-    "com.unity.render-pipelines.lightweight": "file:/Users/rus/Desktop/ScriptableRenderPipeline-2d-staging/com.unity.render-pipelines.lightweight",
-    "com.unity.shadergraph": "file:/Users/rus/Desktop/ScriptableRenderPipeline-2d-staging/com.unity.shadergraph",
     "com.unity.test-framework": "1.0.12",
     "com.unity.textmeshpro": "2.0.0",
     "com.unity.timeline": "1.0.0",