Bump cfg-if from 0.1.7 to 0.1.9 (#154)

Bumps [cfg-if](https://github.com/alexcrichton/cfg-if) from 0.1.7 to 0.1.9.
- [Release notes](https://github.com/alexcrichton/cfg-if/releases)
- [Commits](rust-lang/cfg-if@0.1.7...0.1.9)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -18,7 +18,7 @@ path = "src/main.rs"
 opt-level = 1
 
 [dependencies]
-cfg-if = "0.1.7"
+cfg-if = "0.1.9"
 wasm-bindgen = "0.2.43"
 sha-1 = "0.8.1"
 glutin = { git = "https://github.com/iceiix/glutin", rev = "de52fba20678f3931fba3eb6700774469e48512f" }