7.0.0: 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
  (@thekid)

6.0.1: XP10 compatibility

• Made compatible with XP 10 - @thekid

6.0.0: XP9 Compatiblity

• Heads up: Drop PHP 5.5 support! - @thekid
• Added compatibility with XP9, PHP 7.2 - @thekid
• Dropped dependency on xp-framework/security - @thekid

5.1.2: Networking library compat

• Added compatibility with xp-framework/networking 8.x - @thekid

5.1.1: NscaClient constructor fix

• Fixed issue #1: Wrong constant name - @emil-nasso, @thekid

5.1.0: XP8 Compatibility

• Added forward compatibility with XP 8.0.0 - @thekid

5.0.1: Exception handling fixes

• Fixed exception handling in HeartBeat and NscaClient classes - @kiesel

5.0.0: XP7 compatibility

• Added version compatibility with XP 7 - @thekid

4.0.1: XP7 Forward compatibility

• Fix code to use nameof() instead of the deprecated getClassName()
  method from lang.Generic. See xp-framework/core#120
  (@thekid)

4.0.0: Welcome XP 6.5, PHP 5.5

• Heads up: Dropped PHP 5.4 support. Note: As the main source is not
  touched, unofficial PHP 5.4 support is still available though not tested
  with Travis-CI.