fixed styling on readme

README.md

@@ -28,7 +28,7 @@ Ensure that that ADB recognizes your device with `$ adb devices`.
 
 If a single device exists, install via `$ adb install /path/to/apk.apk`.
 
-Assuming you used Gradle like earlier, the file will be called `module_name-debug.apk` in project_name/module_name/build/outputs/apk/.
+Assuming you used Gradle like earlier, the file will be called `module_name-debug.apk` in `project_name/module_name/build/outputs/apk/`.
 
 Alternatively, you can simply run `./gradlew installDebug` to build, deploy, and debug all in a single command.