Drop Julia 1.0 support

Author: davidanthoff

Project.toml

@@ -15,7 +15,7 @@ IteratorInterfaceExtensions = "0.1.1, 1"
 Requires = "0.5.2"
 TableTraits = "0.3.1, 0.4, 1"
 TableTraitsUtils = "0.2.1, 0.3, 0.4, 1"
-julia = "1"
+julia = "1.1"
 
 [extras]
 DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"