bump scalafix version too

Author: SethTisue

README.md

@@ -55,7 +55,7 @@ The migration rules use scalafix. Please see the [official installation instruct
 
 ```scala
 // project/plugins.sbt
-addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.26")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.29")
 ```
 
 ### Collection213Upgrade

project/plugins.sbt

@@ -9,6 +9,6 @@ addSbtPlugin("org.portable-scala"     % "sbt-scalajs-crossproject"      % crossV
 addSbtPlugin("org.scala-native"       % "sbt-scala-native"              % scalaNativeVersion)
 addSbtPlugin("org.portable-scala"     % "sbt-scala-native-crossproject" % crossVer)
 addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module"              % "2.3.1")
-addSbtPlugin("ch.epfl.scala"          % "sbt-scalafix"                  % "0.9.28")
+addSbtPlugin("ch.epfl.scala"          % "sbt-scalafix"                  % "0.9.29")
 addSbtPlugin("com.eed3si9n"           % "sbt-buildinfo"                 % "0.10.0")
 addSbtPlugin("ch.epfl.scala"          % "sbt-version-policy"            % "1.0.1")