add flow annotation

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/vector/platform/ElectronPlatform.js

@@ -67,7 +67,7 @@ export default class ElectronPlatform extends VectorBasePlatform {
         dis.register(_onAction);
     }
 
-    getHumanReadableName() {
+    getHumanReadableName(): string {
         return 'Electron Platform';
     }
 

src/vector/platform/VectorBasePlatform.js

@@ -35,7 +35,7 @@ export default class VectorBasePlatform extends BasePlatform {
         this._updateFavicon();
     }
 
-    getHumanReadableName() {
+    getHumanReadableName(): string {
         return 'Vector Base Platform';
     }
 

src/vector/platform/WebPlatform.js

@@ -31,7 +31,7 @@ export default class WebPlatform extends VectorBasePlatform {
         this.runningVersion = null;
     }
 
-    getHumanReadableName() {
+    getHumanReadableName(): string {
         return 'Web Platform';
     }