updated custom comparison example.

[landlockedsurfer]

Hi!

Came across your library today, which I find extremely useful. Ran a couple of quick tests and noticed that documentation is possibly out of sync.

This example

import org.joda.time.LocalTime
implicit def localTimeDiffShow: DiffShow[LocalTime] = new DiffShow[LocalTime]{
  def show ( d: LocalTime ) = "LocalTime(" + d.toString + ")"
  def diff( l: LocalTime, r: LocalTime ) =
    if ( l isEqual r ) Identical( show( l ) ) else Different( showChange( l, r ) )
}

resulted in the following compile errors:

[error] aidiff/AiDiffTestSuite.scala:40: constructor Identical in class Identical cannot be accessed in <$anon: ai.x.diff.DiffShow[org.joda.time.LocalTime]>
[error]       if ( l isEqual r ) Identical( show( l ) ) else Different( showChange( l, r ) )
[error]                          ^
[error] aidiff/AiDiffTestSuite.scala:40: constructor Different in class Different cannot be accessed in <$anon: ai.x.diff.DiffShow[org.joda.time.LocalTime]>
[error]       if ( l isEqual r ) Identical( show( l ) ) else Different( showChange( l, r ) )
[error]                                                      ^
[error] two errors found
[error] (test:compileIncremental) Compilation failed
[error] Total time: 1 s, completed Mar 9, 2017 4:01:49 PM

This pull request adjusts the README so that the given example compiles fine.

Cheers, Manfred

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[cvogt]

thx!