avoid deprecated old sbt syntax (#1601)

Author: xuwei-k

CONTRIBUTING.md

@@ -71,7 +71,7 @@ Wrapping up your PR
   while working on this. Add the exclusions to `build.sbt`. Binary
   incompatibilities are expected when modifying `scalapb.proto` and in the
   meantime we have some tolerance for certain type of incompatabilities.
-* In SBT, run `scalafmt` and `test:scalafmt` to ensure the code compiles
+* In SBT, run `scalafmtAll` to ensure the code compiles
   cleanly.
 * Run `./make_plugin_proto.sh` to re-generate all the generated code that
   ships with ScalaPB.

build.sbt

@@ -17,7 +17,7 @@ inThisBuild(
   )
 )
 
-addCommandAlias("fmt", "all scalafmtSbt scalafmt test:scalafmt")
+addCommandAlias("fmt", "all scalafmtSbt scalafmtAll")
 
 lazy val sharedNativeSettings = List(
   nativeLinkStubs := true // for utest

examples_and_formatting.sh

@@ -2,4 +2,4 @@
 set -e 
 ./test_generated_code_checked_in.sh
 for d in examples/*; do cd "$d" && sbt test && cd ../..; done
-sbt -J-Xmx4500M scalafmtCheck test:scalafmtCheck scalafmtSbtCheck
+sbt -J-Xmx4500M scalafmtCheckAll scalafmtSbtCheck