Bump compat to Julia 1.4

Author: lhnguyen-vn

.github/workflows/CI.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.3'
+          - '1.4'
           - '1'
         os:
           - ubuntu-latest

Project.toml

@@ -11,7 +11,7 @@ MLJTuning = "03970b2e-30c4-11ea-3135-d1576263f10f"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 
 [compat]
-julia = "1.3"
 Distributions = "0.25"
 MLJBase = "0.18"
 MLJTuning = "0.6"
+julia = "1.4"