Update specs2-core to 4.9.3

Update sbt to 1.3.10

Update sbt to 1.3.9

Update specs2-core to 4.9.2

Update core to ec8322f

Update specs2-core to 4.9.1

Update sbt-mima-plugin to 0.7.0

Update snakeyaml to 1.26

Update sbt-mima-plugin to 0.6.4

Update uap-core to 4bd50bf

Update sbt-mima-plugin to 0.6.3

Update sbt to 1.3.8

Update core to 1b325e3

Update specs2-core to 4.8.3

Update sbt-release to 1.0.13

Update sbt to 1.3.7

Update specs2-core to 4.8.2

Update specs2-core to 4.8.1

Update sbt to 1.3.6

Update sbt-pgp to 2.0.1

Update sbt to 1.3.5

Update Scala 2.13, etc.

Update sbt to 1.3.4

Update sbt-release to 1.0.12

Update sbt to 1.3.3

Update sbt to 1.3.1

Update sbt-mima-plugin to 0.6.1

Update sbt-pgp to 2.0.0

Update sbt to 1.3.0

Update sbt-mima-plugin to 0.6.0

Update snakeyaml to 1.25

Update sbt-mima-plugin to 0.5.0

Bump uap-core to d6985a7 version

uap-core diff: https://github.com/ua-parser/uap-core/compare/2e6c983e42e7aae7d957a263cb4d3de7ccb...

Bump Scala in cross version to 2.13.0, also enable travis test for Scala 2.13.0

add 2.13.0-RC1 to crossScalaVersions, adjust deps/scalacOptions

Update core to 2e6c983

Update snakeyaml to 1.24

Update core to 6cfb9157

Add phucnh to maintainers

When parsed result is empty string, it's should be convert to None
instead of Some of empty string

Update sbt-release to 1.0.11

Update core to 4e97f111