Enforce version "0.0.0" in plugin sources

Summary: I've noticed that two plugins had wrong versions set and because of that they always published with the same version and not auto-updated. This diff fixes that and also adds safeguard which shows error on "yarn install" if some plugin packages has version set to something different from "0.0.0".

Reviewed By: passy

Differential Revision: D28443509

fbshipit-source-id: d982dbe05fa876717799d9464f900f2173b32f70

desktop/plugins/postinstall.ts

@@ -55,6 +55,16 @@ async function postinstall(): Promise<number> {
           );
         }
       }
+      if (packageJson.version !== '0.0.0') {
+        errors.push(
+          `[ERROR] Plugin package "${path.relative(
+            rootDir,
+            packageDir,
+          )}" has version "${
+            packageJson.version
+          }" set in package.json. Plugin sources must have version set to "0.0.0". Version is automatically bumped when plugin released.`,
+        );
+      }
       if (
         packageJson.keywords &&
         packageJson.keywords.includes('flipper-plugin')