Update .swiftlint.yml (#94)

Avoid specifying swift lint version as this breaks CI every time when there is a new SwiftLint release
2020-08-31 17:42:42 +08:00 · 2020-08-31 17:42:42 +08:00 · 0082acd46a
--- a/.swiftlint.yml
+++ b/.swiftlint.yml
@ -1,5 +1,3 @@
-swiftlint_version: 0.40.0
-
 # these must match project setting values, checks that we don't have redundant availability checks.
 deployment_target:
  iOS_deployment_target: 11.0