Update unitful compat (#80)

Author: rob-luke

Project.toml

@@ -21,7 +21,7 @@ FFTW = "1.1.0"
 FixedPointNumbers = "0.6.1, 0.7, 0.8"
 IntervalSets = "0.3.2, 0.4, 0.5"
 TreeViews = "0.3"
-Unitful = "0.17.0"
+Unitful = "0.17.0, 0.18, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7"
 julia = "1"
 
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