Fix conflict error of ckite

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[info]   +-io.ckite:ckite-finagle:0.2.1 [S]
[info]   | +-com.twitter:finagle-core_2.11:6.27.0 [S]
[info]   | | +-com.twitter:jsr166e:1.0.0
[info]   | | +-com.twitter:util-codec_2.11:6.26.0 [S]
[info]   | | | +-com.twitter:util-core_2.11:6.26.0 [S]
[info]   | | | | +-com.twitter:util-function_2.11:6.26.0 [S]
[info]   | | | | +-org.scala-lang.modules:scala-parser-combinators_2.11:1.0.2..
[info]   | | | | 
[info]   | | | +-commons-codec:commons-codec:1.6

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refs:https://github.com/pablosmedina/ckite/issues/18

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[error] Modules were resolved with conflicting cross-version suffixes in ProjectRef(uri("file:/Users/kerr/IdeaProjects/Reactive-Design-Patterns/"), "chapter13"):
[error]    com.twitter:util-hashing _2.12, _2.11
[error]    com.twitter:finagle-core _2.12, _2.11
[error]    com.twitter:util-codec _2.12, _2.11
[error]    com.twitter:util-jvm _2.12, _2.11
[error]    com.twitter:util-collection _2.12, _2.11
[error]    com.twitter:util-core _2.12, _2.11
[error]    com.twitter:util-function _2.12, _2.11
[error]    com.twitter:util-logging _2.12, _2.11
[error]    com.twitter:util-registry _2.12, _2.11
[error]    com.twitter:util-stats _2.12, _2.11
[error]    org.scala-lang.modules:scala-parser-combinators _2.12, _2.11
[error]    com.twitter:util-app _2.12, _2.11