Merge pull request #1443 from Unity-Technologies/postfx-update-2.0.7

Updated the post-processing package

com.unity.render-pipelines.core/package.json

     "unity": "2018.2",
     "displayName": "Render Pipeline Core Library",
     "dependencies": {
-        "com.unity.postprocessing": "2.0.6-preview"
+        "com.unity.postprocessing": "2.0.7-preview"
     }
 }

com.unity.render-pipelines.high-definition/package.json

     "unity": "2018.2",
     "displayName": "HD Render Pipeline",
     "dependencies": {
-        "com.unity.postprocessing": "2.0.6-preview",
+        "com.unity.postprocessing": "2.0.7-preview",
         "com.unity.render-pipelines.core": "3.0.0-preview",
         "com.unity.shadergraph": "3.0.0-preview"
     }

com.unity.render-pipelines.lightweight/package.json

     "unity": "2018.2",
     "displayName": "Lightweight Render Pipeline",
     "dependencies": {
-        "com.unity.postprocessing": "2.0.6-preview",
+        "com.unity.postprocessing": "2.0.7-preview",
         "com.unity.render-pipelines.core": "3.0.0-preview",
         "com.unity.shadergraph": "3.0.0-preview"
     }