remove incompatible terraform versions

Author: yuhunglin

.circleci/config.yml

@@ -29,15 +29,6 @@ common_steps: &common_steps
      name: "Test: verify plan"
      command: |
        bundle install
-
-       if [ "$TF_LEGACY" != "true" ]; then
-         for example in $(ls -d examples/*/); do
-           pushd $example
-           terraform init
-           popd
-         done
-       fi
-
        bundle exec rake
 
  - save_cache:
@@ -50,20 +41,6 @@ common_steps: &common_steps
        - /usr/local/bundle
 
 jobs:
-  0.8.8:
-    docker:
-      - image: circleci/ruby
-    environment:
-      - TF_VERSION: 0.8.8
-      - TF_LEGACY: true
-    steps: *common_steps
-  0.9.11:
-    docker:
-      - image: circleci/ruby
-    environment:
-      - TF_VERSION: 0.9.11
-      - TF_LEGACY: true
-    steps: *common_steps
   0.10.7:
     docker:
       - image: circleci/ruby
@@ -82,8 +59,6 @@ workflows:
 
   some_flow:
     jobs:
-      - 0.8.8
-      - 0.9.11
       - 0.10.7
       - 0.11.5