Use telegram bots 4.6, java 11 and spring boot 2.2.4

.travis.yml

@@ -1,3 +1,3 @@
 language: java
 jdk:
-  - oraclejdk8
+  - openjdk11

Readme.md

@@ -11,13 +11,13 @@ The starter is available at maven central. Just add the following dependency to
 <dependency>
 	<groupId>com.github.xabgesagtx</groupId>
 	<artifactId>telegram-spring-boot-starter</artifactId>
-	<version>0.19</version>
+	<version>0.21</version>
 </dependency>
 ```
 
 For gradle users just add this to your dependencies:
 ```groovy
-compile('com.github.xabgesagtx:telegram-spring-boot-starter:0.19')
+compile('com.github.xabgesagtx:telegram-spring-boot-starter:0.21')
 ```
 
 The only thing you need to do after adding the dependency is to create a bean for a bot. E.g.:

pom.xml

@@ -13,7 +13,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.1.4.RELEASE</version>
+		<version>2.2.4.RELEASE</version>
 		<relativePath />
 	</parent>
 
@@ -50,8 +50,8 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<java.version>1.8</java.version>
-		<glassfish.version>2.25.1</glassfish.version>
+		<java.version>11</java.version>
+		<glassfish.version>2.29.1</glassfish.version>
 	</properties>
 
 	<dependencies>
@@ -63,7 +63,7 @@
 		<dependency>
 		    <groupId>org.telegram</groupId>
 		    <artifactId>telegrambots</artifactId>
-		    <version>4.2</version>
+		    <version>4.6</version>
 		</dependency>
 
 		<dependency>