simplify the compat section in Project.toml

This continues #40

Author: johnnychen94

Project.toml

@@ -21,9 +21,9 @@ DataStructures = "0.12, 0.13, 0.14, 0.15, 0.16, 0.17"
 Distances = "0.8"
 ImageFiltering = "0.6"
 Images = "0.18, 0.19, 0.20"
-LightGraphs = "1.1, 1.2, 1.3"
+LightGraphs = "1.1"
 RegionTrees = "0.2, 0.3"
-SimpleWeightedGraphs = "1.0, 1.1"
+SimpleWeightedGraphs = "1"
 StaticArrays = "0.9, 0.10, 0.11, 0.12"
 julia = "1"