Bump version number to 1.1.1-SNAPSHOT

CHANGELOG.md

 # Changelog
 
+## [(next version)](./README.md#for-developers)
+
+* (no changes yet)
+
 ## [1.1.0](https://www3.hhu.de/stups/downloads/prob2-jupyter/prob2-jupyter-kernel-1.1.0-all.jar)
 
 * Added a `--user` flag to the installer to allow installing the kernel into the user home directory. This allows installing the kernel without `sudo` when not using a virtual environment.

build.gradle

@@ -9,7 +9,7 @@ plugins {
 	id("com.github.johnrengelman.shadow").version("5.2.0")
 }
 
-version = "1.1.0"
+version = "1.1.1-SNAPSHOT"
 
 final isSnapshot = project.version.endsWith("-SNAPSHOT")