Add display names for HD, LW and Core, and update Unity version req

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

     "name": "com.unity.render-pipelines.core",
     "description": "Core library for Unity render pipelines.",
     "version": "0.1.33",
-    "unity": "2018.1",
+    "unity": "2018.2",
+    "displayName": "Render Pipeline Core Library",
     "dependencies": {
         "com.unity.postprocessing": "2.0.2-preview"
     }

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

     "name": "com.unity.render-pipelines.high-definition",
     "description": "HD Render Pipeline for Unity.",
     "version": "0.1.33",
-    "unity": "2018.1",
+    "unity": "2018.2",
+    "displayName": "HD Render Pipeline",
     "dependencies": {
         "com.unity.postprocessing": "2.0.2-preview",
         "com.unity.render-pipelines.core": "0.1.33"

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

     "name": "com.unity.render-pipelines.lightweight",
     "description": "Lightweight Render Pipeline for Unity.",
     "version": "0.1.33",
-    "unity": "2018.1",
+    "unity": "2018.2",
+    "displayName": "Lightweight Render Pipeline",
     "dependencies": {
         "com.unity.postprocessing": "2.0.2-preview",
         "com.unity.render-pipelines.core": "0.1.33",

com.unity.shadergraph/package.json

     "name": "com.unity.shadergraph",
     "description": "Shader Graph",
     "version": "0.1.19",
-    "unity": "2018.1",
+    "unity": "2018.2",
     "displayName": "Shader Graph",
     "dependencies": {
     }