Update dependency phpstan/phpstan to v1.1.2

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.1.1 -> 1.1.2

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Release Notes

phpstan/phpstan

v1.1.2

Compare Source

Bugfixes

• Properties are read when using AssignRef (=&) too (https://github.com/phpstan/phpstan-src/commit/74787be3fe520a72febf3b779f12e9ad9e471c85), #​5935
• Fixed internal error with method attributes referencing self:: (https://github.com/phpstan/phpstan-src/commit/b5e44f7936d54accf7c5f5e5df9941b884f5b779), #​5951
• Fix stub namespaces in some extensions like pecl_http (https://github.com/ondrejmirtes/BetterReflection/commit/9f2b6eb6b8c17949bf82a46c34167504de0b0782, https://github.com/ondrejmirtes/BetterReflection/commit/bdd25238b192396e633d9ca07a25f2da724a9dc0), #​5460, thanks @​kukulich!
• Do not attempt to clear old containers if the directory does not exist (https://github.com/phpstan/phpstan-src/commit/2427b83fc13d8151034ae57cc625e525897af748)

Function signature fixes

• Mark file resource functions as having side effects (#​698), thanks @​jlherren!
• Use positive integers for various time functions (#​760), thanks @​staabm!

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