bump to julia 1.6 in testing and project

Author: ablaom

.github/workflows/CI.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         julia-version:
-          - "1.0"
+          - "1.6"
           - "1"
           - "nightly"
         os:

Project.toml

@@ -15,7 +15,7 @@ Scratch = "6c6a2e73-6563-6170-7368-637461726353"
 ARFFFiles = "1.4.1"
 HTTP = "0.8, 0.9, 1"
 JSON = "0.21"
-julia = "1"
+julia = "1.6"
 
 [extras]
 Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"