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 jokkedk#116 from drexlma/patch-1

Notice: A non well formed numeric value encountered in /var/www/webgrind/library/Reader.php on line 206

Bumped to version 1.5

- Allow custom CSS
- Miscellaneous bug fixes

Bumped to version 1.4

- Packagist registration
- Configurable table columns
- Remember column sort
- Misc bug fixes

Remove some outdated stuff from README

Bumped to version 1.3

- optional fast (~20x) C++ preprocessor to read cachegrind files (linux only)
- better error handling
- fileviewer fix for mixed PHP/HTML

Bumped to version 1.2

- show average cost
- enable back button
- preprocessor performance
- file viewer highlights and links
- xdebug 2.3
- clear trace files
- step over proxy functions (e.g. call_user_func())