Test with Aqua v0.7 (#586)

* Test with Aqua v0.7

* Update Project.toml

Author: jishnub

Project.toml

@@ -26,7 +26,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
 AbstractFFTs = "0.5, 1"
-Aqua = "0.6"
+Aqua = "0.7"
 BandedMatrices = "0.16, 0.17"
 BlockArrays = "0.14, 0.15, 0.16"
 BlockBandedMatrices = "0.10, 0.11, 0.12"