Bumps httplib2 from 0.9 to 0.18.0.

Sourced from httplib2's changelog.

0.18.0

IMPORTANT security vulnerability CWE-93 CRLF injection Force %xx quote of space, CR, LF characters in uri. Special thanks to Recar https://github.com/Ciyfly for discrete notification. https://cwe.mitre.org/data/definitions/93.html

0.17.4

Ship test suite in source dist httplib2/httplib2#168

0.17.3

IronPython2.7: relative import iri2uri fixes ImportError httplib2/httplib2#163

0.17.2

python3 + debug + IPv6 disabled: https raised "IndexError: Replacement index 1 out of range for positional args tuple" httplib2/httplib2#161

0.17.1

python3: no_proxy was not checked with https httplib2/httplib2#160

0.17.0

feature: Http().redirect_codes set, works after follow(_all)_redirects check This allows one line workaround for old gcloud library that uses 308 response without redirect semantics. httplib2/httplib2#156

0.16.0

IMPORTANT cache invalidation change, fix 307 keep method, add 308 Redirects httplib2/httplib2#151

proxy: username/password as str compatible with pysocks httplib2/httplib2#154

0.15.0

python2: regression in connect() error handling httplib2/httplib2#150

add support for password protected certificate files httplib2/httplib2#143

... (truncated)

• 8373177 v0.18.0 release
• 9fef207 pyproject.toml
• a1457cc IMPORTANT security vulnerability CWE-93 CRLF injection
• 9413ffc v0.17.4 release
• fe3136a Ship new test suite in source dist
• f568487 v0.17.3 release
• fa0c4d2 Switched the iri2uri import to a relative import
• 067b3f2 v0.17.2 release
• 59586b5 Fix debug in HTTPSConnectionWithTimeout.connect
• 0d490f6 travis says matrix is alias for jobs now
• Additional commits viewable in compare view

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