stop testing with Swift 3.0.2 on Linux

.travis.yml

@@ -17,10 +17,6 @@ matrix:
       env: JOB=Linux3.1
       sudo: required
       services: docker
-    - script: make docker_test_302
-      env: JOB=Linux3.0.2
-      sudo: required
-      services: docker
 notifications:
   email: false
   slack: realmio:vPdpsG9NLDo2DNlbqtcMAQuE

Makefile

@@ -91,9 +91,6 @@ release: package archive portable_zip
 docker_test:
 	docker run -v `pwd`:`pwd` -w `pwd` --name swiftlint --rm norionomura/sourcekit:311 swift test
 
-docker_test_302:
-	docker run -v `pwd`:`pwd` -w `pwd` --name swiftlint --rm norionomura/sourcekit:302 swift test
-
 docker_htop:
 	docker run -it --rm --pid=container:swiftlint terencewestphal/htop