Set Julia 1.6 as the new min

Author: sjkelly

Project.toml

@@ -12,7 +12,7 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 BufferedStreams = "0.4.1, 1"
 CodecZlib = "0.5, 0.6, 0.7"
 HDF5 = "0.16"
-julia = "1.3"
+julia = "1.6"
 
 [extras]
 DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"