MAINT: Update defmac dev-dependency to 0.2

Author: bluss

Cargo.toml

@@ -41,7 +41,7 @@ matrixmultiply = { version = "0.1.15" }
 serde = { version = "1.0", optional = true }
 
 [dev-dependencies]
-defmac = "0.1"
+defmac = "0.2"
 quickcheck = { version = "0.7.2", default-features = false }
 rawpointer = "0.1"