Update README.md

Author: alanjcharles

packages/plugins/plugin-device-token/README.md

@@ -3,8 +3,7 @@
 `EnrichmentPlugin` to collect device token values with [Firebase Cloud Messaging](https://firebase.google.com/docs/cloud-messaging). This plugin makes it possible to collect Android's FCM and Apple's APNS device tokens. 
 ## Installation
 
-> warning ""
-> This plugin assumes you are using Firebase Cloud Messaging for Android push notifications. If you are strictly using Apple's Push Notification Services, we recommend creating your own enrichment plugin. 
+⚠️ This plugin assumes you are using Firebase Cloud Messaging for Android push notifications. If you are strictly using Apple's Push Notification Services, we recommend creating your own enrichment plugin. ⚠️ 
 
 Install the dependencies. 
 
@@ -98,4 +97,4 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
-```
+```