Make semver warning more tailored to 8 deprecation and 10 support

src/GrpcService.ts

@@ -1,11 +1,15 @@
 import * as semver from 'semver';
 
-if (!semver.satisfies(process.version, '8.x || 10.x')) {
-  let errorMessage = `Your Function App is currently set to use current version ${process.version}, but the runtime requires Node 8.x or 10.x.
-  For deployed code, please change WEBSITE_NODE_DEFAULT_VERSION in App Settings. On your local machine, you can change node version using 'nvm' (make sure to quit and restart your code editor to pick up the changes).`;
-  console.error(errorMessage);
-  throw new Error(errorMessage);
-} 
+// If user is not using Node.js v10, warn to upgrade to v10
+if (!semver.satisfies(process.version, '10.x')) {
+    let errorMessage = `Your Function App is currently set to use Node.js version ${process.version}, but the runtime requires a 10.x version.
+    For deployed code, please change WEBSITE_NODE_DEFAULT_VERSION in App Settings. On your local machine, you can change node version using 'nvm' (make sure to quit and restart your code editor to pick up the changes).`;
+    console.error(errorMessage);
+    // Don't fail Node.js v8 users for now
+    if (!semver.satisfies(process.version, '8.x')) {
+        throw new Error(errorMessage);
+    }
+}
 
 import { Duplex } from 'stream';
 import * as grpc from 'grpc';