Updated Water package.json

Packages/com.verasl.water-system/package.json

 {
     "name": "com.verasl.water-system",
     "description": "A water system for LWRP.",
-    "version": "1.0.1-preview",
-    "unity": "2018.2",
+    "version": "1.2.0-preview",
+    "unity": "2019.1",
-        "com.unity.render-pipelines.lightweight": "3.3.0-preview",
-        "com.unity.render-pipelines.core": "3.3.0-preview"
+        "com.unity.render-pipelines.lightweight": "5.2.1"
     }
 }