leave out yarn version peg
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		@@ -2,14 +2,12 @@ machine:
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  node:
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    version: 6.5.0
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  environment:
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      YARN_VERSION: 0.28.4
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      CONTRACTS_COMMIT_HASH: '78fe8dd'
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      PATH: "${PATH}:${HOME}/${CIRCLE_PROJECT_REPONAME}/node_modules/.bin"
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dependencies:
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  override:
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    - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version $YARN_VERSION
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    - yarn install --pure-lockfile
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    - yarn
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  cache_directories:
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    - ~/.cache/yarn
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