Merge pull request #425 from ptrdom/fix-appveyor

Fix AppVeyor

Author: sjrd

appveyor.yml

@@ -1,8 +1,9 @@
 version: '{build}'
 os: Windows Server 2012
 install:
-  - ps: Install-Product node 12
-  - cmd: choco install sbt --version 1.4.0 -ia "INSTALLDIR=""C:\sbt"""
+  - ps: Install-Product node 16.14.2
+  - cmd: npm install -g [email protected]
+  - cmd: choco install sbt --version 1.6.2 -ia "INSTALLDIR=""C:\sbt"""
   - cmd: SET PATH=C:\sbt\bin;%JAVA_HOME%\bin;%PATH%
   - cmd: SET SBT_OPTS=-XX:MaxPermSize=2g -Xmx4g
 build: off