Fix compilation errors in new vala

.travis.yml

@@ -3,7 +3,7 @@
 language: node_js
 
 node_js:
-  - 10/*
+  - 10.17.0
 
 sudo: required
 

src/VGriveClient.vala

@@ -1063,7 +1063,7 @@ namespace App {
         }
 
         public DriveFile get_file_info_extra(string file_id, string fields) throws ErrorGoogleDriveAPI {
-            RequestParam[1] params = new RequestParam[1];
+            RequestParam[] params = new RequestParam[1];
             params[0] = {"fields", fields};
             string res = this.make_request("GET", this.api_uri+"/files/"+file_id, params, null, null, false).response;
             var parser = new Json.Parser ();

tests/test.vala

@@ -5,7 +5,7 @@ public abstract class Gee.TestCase : Object {
 
 	public delegate void TestMethod ();
 
-	public TestCase (string name) {
+	protected TestCase (string name) {
 		this.suite = new GLib.TestSuite (name);
 	}