Filter out some deps from the updates report

[fedefernandez]

With these changes, only scalajs is shown in the dependency updates report:

sbt:iota> dependencyUpdates
[info] No dependency updates found for iotaz-core
[info] No dependency updates found for iota
[info] No dependency updates found for iota-examples-scalaz
[info] No dependency updates found for iota-core
[info] Found 3 dependency updates for iota-core
[info]   org.scala-js:scalajs-compiler:plugin->default(compile) : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-library                           : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-test-interface:test               : 0.6.20 -> 0.6.22
[info] Found 3 dependency updates for iotaz-core
[info]   org.scala-js:scalajs-compiler:plugin->default(compile) : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-library                           : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-test-interface:test               : 0.6.20 -> 0.6.22
[info] Found 3 dependency updates for iotaz-scalacheck
[info]   org.scala-js:scalajs-compiler:plugin->default(compile) : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-library                           : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-test-interface:test               : 0.6.20 -> 0.6.22
[info] Found 3 dependency updates for iota-scalacheck
[info]   org.scala-js:scalajs-compiler:plugin->default(compile) : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-library                           : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-test-interface:test               : 0.6.20 -> 0.6.22
[info] No dependency updates found for iotaz-scalacheck
[info] Found 3 dependency updates for iota-examples-scalaz
[info]   org.scala-js:scalajs-compiler:plugin->default(compile) : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-library                           : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-test-interface:test               : 0.6.20 -> 0.6.22
[info] No dependency updates found for iota-examples-cats
[info] No dependency updates found for iota-scalacheck
[info] Found 3 dependency updates for iota-examples-cats
[info]   org.scala-js:scalajs-compiler:plugin->default(compile) : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-library                           : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-test-interface:test               : 0.6.20 -> 0.6.22
[info] No dependency updates found for iota-readme
[info] No dependency updates found for iota-docs
[info] No dependency updates found for iota-bench
[info] No dependency updates found for iota-tests
[info] No dependency updates found for iotaz-tests
[info] Found 3 dependency updates for iota-tests
[info]   org.scala-js:scalajs-compiler:plugin->default(compile) : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-library                           : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-test-interface:test               : 0.6.20 -> 0.6.22
[info] Found 3 dependency updates for iotaz-tests
[info]   org.scala-js:scalajs-compiler:plugin->default(compile) : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-library                           : 0.6.20 -> 0.6.22
[info]   org.scala-js:scalajs-test-interface:test               : 0.6.20 -> 0.6.22