2.1.1: Fix $_ENV accesses

• Fixed issue #10: lang.IndexOutOfBoundsException (Undefined index: XP_VERSION)
  on systems where the PHP variables_order setting does not include E.
  (@thekid)

2.1.0: BCMath, faster PHP builds

• Speed up build by using -j $(nproc) flag for make, see #7 - @thekid
• Enabled bcmath extension - @thekid

2.0.0: Packaging

This major release changes the packaging defaults. This way, files to be incuded can be specified more flexibly via command line arguments.

• Increased code coverage for classes in public API to 100%, see issue #6
  (@thekid)
• Fixed Context::remainingTime()'s return type, which can include NULL.
  (@thekid)
• Changed packaging to no longer include src directory automatically,
  it might contain static resources like e.g. a web application's images.
  Typically, xp lambda package src/main/php will be what you want.
  (@thekid)

1.1.0: Environment accessors

• Added accessor for environment varibales, Environment::variable()
  (@thekid)
• Added accessor for temporary directory, Environment::tempDir()
  (@thekid)
• Added accessor for environment root path, Environment::taskroot()
  (@thekid)

1.0.0: Unique given sources, BZ2

The first major release includes final touches to the packaged ZIP file.

• Merged PR #5: Unique given sources, preventing them being added to the
  ZIP file twice
  (@thekid)
• Also support bzip2 compression if PHP extension is loaded, but keep
  preference on gzip, which has performed better in my tests.
  (@thekid)

0.7.0: Runtime versioning

• Fixed issue #3: Context object compatibility. Context now also declares
  the properties logGroupName and logStreamName like in NodeJS, and
  uses memoryLimitInMB instead of memorySize.
  (@thekid)
• Merged PR #4: Pass version along to docker images. Use xp lambda runtime
  to use the current PHP version, xp lambda runtime:8.0 to use the newest
  PHP 8.0 release, and xp lambda runtime:8.0.10 for version pinning.
  (@thekid)
• Ignore any directories inside src/test and src/it as well any hidden
  directories when packaging.
  (@thekid)

0.6.0: Shrink runtime layer

• Decreased size of runtime layer from ~8.4 MB to ~2.4 MB by using strip
  and zip -9, reducing layer publishing time as well as initialization duration
  https://stackoverflow.com/questions/4179010/how-to-strip-executables-thoroughly

0.5.0: Deployment file name

• Renamed task.zip to function.zip in order not to introduce more
  vocabulary than necessary
  (@thekid)

0.4.0: Test subcommand

• Renamed xp lambda invoke to xp lambda test to make clear we're
  not invoking the deployed lambda
  (@thekid)

0.3.0: Packaging

• Implemented xp lambda package subcommand for packaging lambda code
  including the src and vendor directories as requested in issue #2
  (@thekid)
• Renamed context member payload to payloadLength - @thekid