update tgbotapi and add webapps example

build.gradle

@@ -1,7 +1,7 @@
 allprojects {
     repositories {
         mavenLocal()
-        jcenter()
+        mavenCentral()
         if (project.hasProperty("GITHUB_USER") && project.hasProperty("GITHUB_TOKEN")) {
             maven {
                 url "https://maven.pkg.github.com/InsanusMokrassar/TelegramBotAPI"
@@ -12,4 +12,4 @@ allprojects {
             }
         }
     }
-}
+}