Fixing issue where Array.includes() is not supported by RN for iOS8. This commit closes #26

ReactNativePermissions.js

 	}
 
 	requestPermission(permission, type) {
-		let options; 
-
-		if (!this.getPermissionTypes().includes(permission)) {
+		let options;
+		
+		if (this.getPermissionTypes().indexOf(permission) === -1) {
 			return Promise.reject(`ReactNativePermissions: ${permission} is not a valid permission type on ${Platform.OS}`)
 		} else if (permission == 'backgroundRefresh'){
 			return Promise.reject('ReactNativePermissions: You cannot request backgroundRefresh')