Add client.getMessage() (#428)

* Add client.getMessage

* Add shortcuts

* build it..

* Add missing ~ in note docs

* ............

src/Structures/PMChannel.js

@@ -55,4 +55,8 @@ export default class PMChannel extends Channel {
 	getLogs() {
 		return this.client.getChannelLogs.apply(this.client, reg(this, arguments));
 	}
+
+	getMessage() {
+		return this.client.getMessage.apply(this.client, reg(this, arguments));
+	}
 }

src/Structures/TextChannel.js

@@ -50,6 +50,10 @@ export default class TextChannel extends ServerChannel{
 		return this.client.getChannelLogs.apply(this.client, reg(this, arguments));
 	}
 
+	getMessage() {
+		return this.client.getMessage.apply(this.client, reg(this, arguments));
+	}
+
 	startTyping(){
 		return this.client.startTyping.apply(this.client, reg(this, arguments));
 	}

src/Structures/User.js

@@ -114,6 +114,10 @@ export default class User extends Equality{
 		return this.client.getChannelLogs.apply(this.client, reg(this, arguments));
 	}
 
+	getMessage() {
+		return this.client.getMessage.apply(this.client, reg(this, arguments));
+	}
+
 	hasRole(role) {
 		return this.client.memberHasRole.apply(this.client, [this, role]);
 	}