Revert "Update to sbt-bintray 0.4.0"

[fthomas]

Reverts #285 because of this error during the last release:

> coreJVM/bintraySyncMavenCentral
[trace] Stack trace suppressed: run last coreJVM/*:bintraySyncMavenCentral for the full output.
[error] (coreJVM/*:bintraySyncMavenCentral) java.lang.NoSuchMethodError: org.json4s.Formats.emptyValueStrategy()Lorg/json4s/prefs/EmptyValueStrategy;
[error] Total time: 0 s, completed Jun 3, 2017 12:12:32 AM
>
> last coreJVM/*:bintraySyncMavenCentral
java.lang.NoSuchMethodError: org.json4s.Formats.emptyValueStrategy()Lorg/json4s/prefs/EmptyValueStrategy;
    at org.json4s.native.JsonMethods$class.render(JsonMethods.scala:29)
    at org.json4s.native.JsonMethods$.render(JsonMethods.scala:62)
    at bintry.Methods$json$.str(Methods.scala:19)
    at bintry.Methods$Repo$Package$Version.mavenCentralSync(Methods.scala:210)
    at bintray.BintrayRepo$$anonfun$12.apply(BintrayRepo.scala:126)
    at bintray.BintrayRepo$$anonfun$12.apply(BintrayRepo.scala:126)
    at bintray.Bintray$await$.result(Bintray.scala:118)
    at bintray.BintrayRepo.syncMavenCentral(BintrayRepo.scala:125)
    at bintray.BintrayPlugin$$anonfun$bintrayPublishSettings$18.apply(BintrayPlugin.scala:113)
    at bintray.BintrayPlugin$$anonfun$bintrayPublishSettings$18.apply(BintrayPlugin.scala:111)
    at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
    at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
    at sbt.std.Transform$$anon$4.work(System.scala:63)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:228)
    at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
    at sbt.Execute.work(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:228)
    at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
    at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)
[error] (coreJVM/*:bintraySyncMavenCentral) java.lang.NoSuchMethodError: org.json4s.Formats.emptyValueStrategy()Lorg/json4s/prefs/EmptyValueStrategy;

[codecov-io]

Codecov Report

Merging #289 into master will decrease coverage by 2.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
- Coverage   99.25%   97.08%   -2.17%     
==========================================
  Files          36       36              
  Lines         403      412       +9     
  Branches        3        3              
==========================================
  Hits          400      400              
- Misses          3       12       +9

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[fthomas]

This is a known regression: sbt/sbt-bintray#104