Raise the minimum version of bitflags to 1.1

This prevents warnings about "try! is deprecated" when using the latest
compiler and -Zminimal_versions.

Author: asomers

Cargo.toml

@@ -17,7 +17,7 @@ exclude     = [
 
 [dependencies]
 libc = { version = "0.2.60", features = [ "extra_traits" ] }
-bitflags = "1.0"
+bitflags = "1.1"
 cfg-if = "0.1.2"
 void = "1.0.2"