fix(deps): update dependency doctrine/collections to v2

This MR contains the following updates:

Package	Type	Update	Change
doctrine/collections (source)	require	major	^1.6 -> ^2.0

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Release Notes

doctrine/collections

v2.0.1

Compare Source

Release Notes for 2.0.1

2.0.x bugfix release (patch)

2.0.1

• Total issues resolved: 0
• Total pull requests resolved: 2
• Total contributors: 2

Bug,Static Analysis

• 340: Mark closure arguments as always-provided thanks to @​greg0ire

Documentation

• 338: Fix markup thanks to @​xepozz

v2.0.0

Compare Source

Release Notes for 2.0.0

2.0.0

• Total pull requests resolved: 12
• Total contributors: 9

Types

• 332: Add missing param type declarations thanks to @​greg0ire
• 312: Stop returning true from Collection::add() thanks to @​greg0ire
• 192: [2.0] Strict types, native parameter & return types thanks to @​jwage

Static Analysis

• 330: Make Selectable template covariant thanks to @​greg0ire
• 185: Update Collection::filter docblock to add key parameter to closure thanks to @​nicholasruunu

Improvement

• 252: [2.0] Add new methods Collection::findFirst and Collection::reduce thanks to @​VincentLanglet
• 176: Preserve keys in ArrayCollection for Criteria firstresults/maxresults thanks to @​SenseException
• 100: Allow use array and multi arguments thanks to @​vlastv

Internal

• 197: Upgrade to PHPUnit 8. thanks to @​jwage
• 215: Enhancement: improve test suite thanks to @​BackEndTea

Bugfixes

• 189: Fix return type of Collection::key() thanks to @​enumag

Documentation

• 187: Documentation for serialization of collections thanks to @​SenseException

v1.8.0

Compare Source

Release Notes for 1.8.0

Feature release (minor)

1.8.0

• Total issues resolved: 0
• Total pull requests resolved: 1
• Total contributors: 1

Static Analysis

• 322: Extract read-only part of Collection thanks to @​greg0ire

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