Update dependencies

Cargo.lock

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 ]
 
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 [[package]]
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 dependencies = [
- "gleam 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gleam 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
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Cargo.toml

 cgmath = "0.16"
 clap = "2.29"
 directories = "1.0"
-env_logger = "0.5.0-rc.2"
-gl = "0.10"
-glutin = "0.18"
+env_logger = "0.6"
+gl = "0.11"
+glutin = "0.19"
 image = "0.20"
 lazy_static = "1.0"
 linked-hash-map = "0.5.0"