Update Scala to 2.13.15

Author: piotrp

README.md

@@ -6,11 +6,11 @@ Our solution to deploy Scala 2.13 code to Flink, until it's officially supported
 
 ```bash
 rm $FLINK_HOME/lib/flink-scala*.jar
-wget https://repo1.maven.org/maven2/pl/touk/flink-scala-2-13_2.13/1.1.1/flink-scala-2-13_2.13-1.1.1-assembly.jar -O $FLINK_HOME/lib/flink-scala-2-13_2.13-1.1.1-assembly.jar
+wget https://repo1.maven.org/maven2/pl/touk/flink-scala-2-13_2.13/1.1.2/flink-scala-2-13_2.13-1.1.2-assembly.jar -O $FLINK_HOME/lib/flink-scala-2-13_2.13-1.1.1-assembly.jar
 ```
 
 ```scala
-libraryDependencies += "pl.touk" %% "flink-scala-2-13" % "1.1.1"
+libraryDependencies += "pl.touk" %% "flink-scala-2-13" % "1.1.2"
 ```
 
 ## Publishing

build.sbt

@@ -1,6 +1,6 @@
-version := "1.1.1"
+version := "1.1.2"
 
-scalaVersion := "2.13.12"
+scalaVersion := "2.13.15"
 
 name := "flink-scala-2.13"