1.5.17_188: Merge pull request #150 from wuan/update_versions

update versions

1.5.15_186

• updated Kotlin version
• improved blitzortung.org error handling

1.5.13_184

Version 1.5.13:

• fix location handler lifecycle

1.5.12_183

Version 1.5.12:

• fix alert handler lifecycle

1.5.11_182

Version 1.5.11:

• avoid wakelock collisions

1.5.10_181

Version 1.5.10:

• fixed background query time offset
• avoid invalidation of location
• improved logging

1.5.9_180

Version 1.5.9:

• fixed non persistent notifications
• added message at network errors

1.5.8_179

prepare release

1.5.7_178

fixed test

1.5.6_177

prepare release