kotlin: 1.2.41 -> 1.2.50

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/kotlin/versions.

These checks were done:

- built on NixOS
- /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/kotlin passed the binary check.
- Warning: no invocation of /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/kotlin-dce-js had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/kotlinc had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/kotlinc-js had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/kotlinc-jvm had a zero exit code or showed the expected version
- /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/.kotlin-wrapped passed the binary check.
- Warning: no invocation of /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/.kotlin-dce-js-wrapped had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/.kotlinc-wrapped had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/.kotlinc-js-wrapped had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50/bin/.kotlinc-jvm-wrapped had a zero exit code or showed the expected version
- 2 of 10 passed binary check by having a zero exit code.
- 0 of 10 passed binary check by having the new version present in output.
- found 1.2.50 with grep in /nix/store/1kjxxx12sxgrggmqggadviahxjhngv4p-kotlin-1.2.50
- directory tree listing: https://gist.github.com/7d95bbd681ebe9729db46873f969f4fc
- du listing: https://gist.github.com/3802b96fcef5fe86923e965fb53fc6b0