dump support for julia <1.6

Author: ablaom

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.3'
+          - '1.6'
           - '1' # automatically expands to the latest stable 1.x release of Julia.
         os:
           - ubuntu-latest

Project.toml

@@ -18,7 +18,7 @@ MLJModelInterface = "1.4"
 ScientificTypes = "2.2.2, 3"
 ScientificTypesBase = "2.2.0, 3"
 TextAnalysis = "0.7.3"
-julia = "1.3"
+julia = "1.6"
 
 [extras]
 MLJBase = "a7f614a8-145f-11e9-1d2a-a57a1082229d"