fix shellcheck

.travis.yml

@@ -13,12 +13,6 @@ env:
   global:
     - SHFMT_URL=https://github.com/mvdan/sh/releases/download/v0.4.0/shfmt_v0.4.0_linux_amd64
 
-addons:
-  apt:
-    sources:
-    - debian-sid    # Grab shellcheck from the Debian repo (o_O)
-    packages:
-    - shellcheck
 
 install:
   - if [ "$TRAVIS_OS_NAME" = 'osx' ]; then
@@ -40,7 +34,6 @@ script:
   - if [ "$TRAVIS_OS_NAME" = "linux" -a "$NGROK_TOKEN" ]; then sudo TEST_LOCAL="$TEST_LOCAL" NGROK_TOKEN="$NGROK_TOKEN" ./rundocker.sh testplat ubuntu:latest ; fi
   - if [ "$TRAVIS_OS_NAME" = "osx" -a "$NGROK_TOKEN" ]; then sudo TEST_LOCAL="$TEST_LOCAL" NGROK_TOKEN="$NGROK_TOKEN" ACME_OPENSSL_BIN="$ACME_OPENSSL_BIN" ./letest.sh ; fi
 
-
 matrix:
   fast_finish: true