feat!: dropped Node@6 and Node@8

tools/scripts/lint.sh

@@ -1,11 +1,4 @@
 #!/bin/bash
 set -e;
 
-node_v=$(node --version) ;
-if [[ "${node_v%%.*}" == 'v4' || "${node_v%%.*}" == 'v6' ]]
-then
-  echo 'Old node version - Skipping eslint'
-else
-  eslint ./test ./lib
-fi
-
+eslint ./test ./lib