Merge pull request #71 from nim-lang/ringabout-patch-1

adds linux_arm64

Author: ringabout

scripts/choosenim-unix-init.sh

@@ -40,7 +40,7 @@ install() {
   local ext=""
 
   case $platform in
-    *macosx_amd64* | *macosx_arm* | *linux_amd64* )
+    *macosx_amd64* | *macosx_arm* | *linux_amd64* | *linux_arm64* )
       ;;
     *windows_amd64* )
       # Download ZIP for Windows