Version bump

Version bump

Bump to v.1.9.1

Bumped to version 1.9

- Xdebug 3 compatibility
- Download profile link

Bumped to version 1.8

- Callgraph docker support
- Opt-in file disclosure
- PHP 5 compatibility

Bumped to version 1.7

 - Xdebug file reader fix

Bumped to version 1.6

 - Performance improvements
 - PHP 7+ compatibility
 - Miscellaneous bug fixes

Merge pull request #116 from drexlma/patch-1

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Bumped to version 1.5

- Allow custom CSS
- Miscellaneous bug fixes