bump RData version

Author: bkamins

Project.toml

@@ -16,7 +16,7 @@ CSV = "0.5, 0.6, 0.7, 0.8"
 CodecZlib = "0.4, 0.5, 0.6, 0.7"
 DataFrames = "0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 1"
 FileIO = "1"
-RData = "0.5, 0.6, 0.7"
+RData = "0.5, 0.6, 0.7, 0.8"
 Reexport = "0.2, 1.0"
 julia = "1"