Bumping max version of ProxyManager, supporting 0.4.0
merged branch Ocramius/bump/proxymanager-dependency-bump (PR #8382)

This PR was merged into the master branch.

Discussion
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Bumping max version of ProxyManager, supporting 0.4.0

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Commits
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18352fc Bumping max version of ProxyManager, supporting 0.4.0