8.0.0: XP11 compatibility

• Made library compatible with XP 11, xp-framework/collections 10.0.0
  (@thekid)

8.0.0: Drop PHP 5 support

• Implemented xp-framework/rfc#334: Drop PHP 5.6:
  . Heads up: Minimum required PHP version now is PHP 7.0.0
  . Rewrote code base, grouping use statements
  . Rewrote isset(X) ? X : default to X ?? default
  . Converted newinstance to anonymous classes
  (@thekid)

7.0.1: XP10 compatibility

• Made compatible with XP 10 - @thekid

7.0.0: XP9 Compatibility

• Fixed PHP 7.2 compatibility - @thekid
• Heads up: Dropped PHP 5.5 support - @thekid
• Made this library compatible with XP9 - @thekid

6.6.1: XP7 compatibility

• Fix build w/ XP 7 - @kiesel

6.6.0: Framework compatibility

• Make compatible w/ newer XP Framework versions - @kiesel, @friebe

6.5.2: Static initializer fixes

• Merged PR #1: Declare static initializer in a MockProxy - @kiesel

6.5.1: XP7 Forward compatibility

• Fixed test suite for forward compatibility with XP7 - @thekid

6.5.0: Enter PHP 5.5

• Heads up: Changed minimum XP version to run webtests to XP
  6.5.0, and with it the minimum PHP version to PHP 5.5
  (@thekid)
• Added dependency on collectons library which has since been extracted
  from XP core.
  (@thekid)

6.4.2: Extract from core

• Heads up: Split library from xp-framework/core as per xp-framework/rfc#293
  (@thekid)