Make SNAPSHOT versions stable

Author: japgolly

downstream-tests/version.sbt

@@ -0,0 +1 @@
+../library/version.sbt

library/version.sbt

@@ -0,0 +1,5 @@
+// Remove timestamp from SNAPSHOT versions
+ThisBuild / version := {
+  val v = (ThisBuild / version).value
+  v.replaceFirst("""\+\d{8}-\d{4}(?=-SNAPSHOT)""", "")
+}