Update dependencies

wdv4758h · wdv4758h · commit b8a88af46f6d · 2016-07-31T00:33:31.000+08:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -12,6 +12,6 @@ name = "sdl2_image"
 path = "src/sdl2_image/lib.rs"
 
 [dependencies]
-bitflags = "0.5"
-sdl2 = "0.21.0"
-sdl2-sys = "0.21.0"
+bitflags = "0.7"
+sdl2 = "0.22.0"
+sdl2-sys = "0.22.0"
