Bump slim/slim from 2.4.3 to 2.6.0

[dependabot[bot]]

Bumps slim/slim from 2.4.3 to 2.6.0.

Commits

• e434525 Merge pull request #1040 from sarciszewski/patch-1
• 9fa6514 Fix #1034 (CVE-2015-2171)
• 2d80935 Correct terminology in README
• 2c434e4 Merge pull request #1032 from TomasVotruba/patch-1
• abe852a travis: PHP 7.0 nightly added
• 18fac76 Merge pull request #1025 from sekjun9878/issue-962
• 6bc545f Merge pull request #1024 from sekjun9878/http-response-status-codes
• e1e8b45 Fixes #962, Missing SERVER_PORT on GAE.
• 864d0f3 Add HTTP status codes from new RFCs.
• 7921b19 Merge pull request #912 from wadewomersley/master
• Additional commits viewable in compare view

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