change some parameters

* fixes #13
* use a HashMap for timetableRequests count
* api version 1.2.0
* software version 1.2.3

build.gradle

@@ -16,7 +16,7 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-web'
     implementation 'org.jetbrains.kotlin:kotlin-reflect'
     implementation 'org.jetbrains.kotlin:kotlin-stdlib'
-    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.6'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.7'
     implementation 'org.jsoup:jsoup:1.13.1'
     implementation 'com.google.code.gson:gson:2.8.6'