add bors to ink repo (#357)

* add bors to ink repo

* travis fails on a *.tmp branch; turned off 'build pushed branches' from config and set only 'master' here because travis anyways runs on PRs

* statuses reviewed, reordered

* less statuses, longer timeout (10 min didn't work)
15 jobs for master in 9 minutes and 11 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Check
passed #426057
linux-docker
check-std

00:00:58

passed #426058
linux-docker
check-wasm

00:01:25

 
  Workspace
passed #426059
linux-docker
build-std

00:02:44

passed #426060
linux-docker
build-wasm

00:01:53

passed #426062
linux-docker
clippy-std

00:01:23

passed #426063
linux-docker
clippy-wasm

00:01:25

passed #426064
linux-docker
fmt

00:00:15

passed #426061
linux-docker
test

00:02:31

 
  Examples
passed #426067
linux-docker
examples-clippy-std

00:01:15

passed #426068
linux-docker
examples-clippy-wasm

00:01:05

passed #426069
linux-docker
examples-contract-build

00:00:25

passed #426066
linux-docker
examples-fmt

00:00:16

passed #426070
linux-docker
examples-generate-metadata

00:02:06

passed #426065
linux-docker
examples-test

00:01:10

 
  Publish
passed #426071
linux-docker
publish-docs

00:01:24