Use the 'face' event for Facemesh event emitter

Author: bomanimc

docs/reference/facemesh.md

@@ -26,8 +26,8 @@ function modelLoaded() {
   console.log('Model Loaded!');
 }
 
-// Listen to new 'predict' events
-facemesh.on('predict', results => {
+// Listen to new 'face' events
+facemesh.on('face', results => {
   predictions = results;
 });
 ```
@@ -135,19 +135,19 @@ const facemesh = ml5.facemesh(?video, ?options, ?callback);
 
 ***
 
-#### .on('predict', ...)
+#### .on('face', ...)
 > An event listener that returns the results when a new face detection prediction occurs.
 
   ```js
-  facemesh.on('predict', callback);
+  facemesh.on('face', callback);
   ```
 
 📥 **Inputs**
 
 * **callback**: REQUIRED.  A callback function to handle new face detection predictions. For example:
 
   ```js
-  facemesh.on('predict', results => {
+  facemesh.on('face', results => {
     // do something with the results
     console.log(results);
   });

examples/p5js/Facemesh/Facemesh_Image/sketch.js

@@ -19,7 +19,7 @@ function setup() {
 function imageReady() {
   facemesh = ml5.facemesh(modelReady);
 
-  facemesh.on("predict", results => {
+  facemesh.on("face", results => {
     predictions = results;
   });
 }

examples/p5js/Facemesh/Facemesh_Webcam/sketch.js

@@ -11,7 +11,7 @@ function setup() {
 
   // This sets up an event that fills the global variable "predictions"
   // with an array every time new predictions are made
-  facemesh.on("predict", results => {
+  facemesh.on("face", results => {
     predictions = results;
   });
 

src/Facemesh/index.js

@@ -64,7 +64,10 @@ class Facemesh extends EventEmitter {
     const { flipHorizontal } = this.config;
     const predictions = await this.model.estimateFaces(input, flipHorizontal);
     const result = predictions;
+    // Soon, we will remove the 'predict' event and prefer the 'face' event. During
+    // the interim period, we will both events.
     this.emit("predict", result);
+    this.emit("face", result);
 
     if (this.video) {
       return tf.nextFrame().then(() => this.predict());