Fill out typings tests

src/Terminal.integration.ts

@@ -147,7 +147,8 @@ if (os.platform() !== 'win32') {
 }
 
 describe('typings', () => {
-  it('should throw no compile errors', () => {
+  it('should throw no compile errors', function () {
+    this.timeout(20000);
     let result = cp.spawnSync(path.join(__dirname, '..', 'node_modules', '.bin', 'tsc'), {
       cwd: path.join(__dirname, '..', 'fixtures', 'typings-test')
     });

src/Terminal.ts

@@ -414,7 +414,7 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
    */
   public getOption(key: StringOption): string;
   public getOption(key: BooleanOption): boolean;
-  public getOption(key: StringArrayOption): number[];
+  public getOption(key: StringArrayOption): string[];
   public getOption(key: NumberOption): number;
   public getOption(key: GeometryOption): [number, number];
   public getOption(key: HandlerOption): (data: string) => void;