package versions update

Author: pszufe

Manifest.toml

@@ -15,11 +15,11 @@ SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
-DataStructures = ">=0.15.0"
-HTTP = ">=0.7.0"
-JSON = ">=0.19.0"
-LibExpat = ">=0.5.0"
-LightGraphs = "1.1.0"
+DataStructures = "^0.17.0"
+HTTP = "^0.8.0"
+JSON = "^0.21.0"
+LibExpat = "^0.6.0"
+LightGraphs = "^1.3.0"
 julia = "1.0.0"
 
 [extras]