fix MensaParser & update spring boot, kotlin

* fixed the MensaParser(), it should now work more reliable
* updated spring boot 2.2.4 -> 2.2.5
* updated kotlin 1.3.61 -> 1.3.70
* clean up MensaParserTest

src/main/kotlin/org/mosad/thecitadelofricks/APIController.kt

@@ -48,7 +48,7 @@ class APIController {
 
     companion object {
         const val apiVersion = "1.1.4"
-        const val softwareVersion = "1.2.1"
+        const val softwareVersion = "1.2.2"
         val startTime = System.currentTimeMillis() / 1000
     }