build cleanup: drop old Scala.js cruft

Author: SethTisue

Diff for: .circleci/config.yml

@@ -128,14 +128,6 @@ workflows:
           name: jdk14_3.0
           java_version: jdk14
           scala_version: 3.0.0-M2
-      - scalajs_job:
-          name: sjs0.6_2.12
-          scala_version: 2.12.10
-          scalajs_version: 0.6.33
-      - scalajs_job:
-          name: sjs0.6_2.13
-          scala_version: 2.13.1
-          scalajs_version: 0.6.33
       - scalajs_job:
           name: sjs1.0_2.12
           scala_version: 2.12.12

Diff for: .travis.yml

@@ -15,13 +15,6 @@ env:
   - SCALAJS_VERSION=         ADOPTOPENJDK=11
   - SCALAJS_VERSION=         ADOPTOPENJDK=13
 
-matrix:
-  exclude:
-    - scala: 3.0.0-M1
-      env: SCALAJS_VERSION=0.6.33   ADOPTOPENJDK=8
-    - scala: 3.0.0-M1
-      env: SCALAJS_VERSION=1.0.1    ADOPTOPENJDK=8
-
 install:
   - git fetch --tags # get all tags for sbt-dynver
 

Diff for: build.sbt

@@ -45,7 +45,6 @@ lazy val xml = crossProject(JSPlatform, JVMPlatform)
 
     scalaModuleMimaPreviousVersion := {
       if (isDotty.value) None // No such release yet
-      // else if (System.getenv("SCALAJS_VERSION") == "1.0.1") None
       else Some("1.3.0")
     },
     mimaBinaryIssueFilters ++= {