chore(Cargo): update dependencies

Cargo.toml

@@ -18,20 +18,20 @@ travis-ci = { repository = "fdehau/tui-rs" }
 default = ["termion"]
 
 [dependencies]
-bitflags = "1.0.1"
-cassowary = "0.3.0"
-itertools = "0.7.8"
-log = "0.4.1"
-either = "1.5.0"
-unicode-segmentation = "1.2.0"
-unicode-width = "0.1.4"
-termion = { version = "1.5.1", optional = true }
-rustbox = { version = "0.11.0", optional = true }
+bitflags = "1.0"
+cassowary = "0.3"
+itertools = "0.7"
+log = "0.4"
+either = "1.5"
+unicode-segmentation = "1.2"
+unicode-width = "0.1"
+termion = { version = "1.5", optional = true }
+rustbox = { version = "0.11", optional = true }
 crossterm = { version = "0.4", optional = true }
 
 [dev-dependencies]
-stderrlog = "0.3.0"
-rand = "0.4.2"
+stderrlog = "0.4"
+rand = "0.4"
 
 [[example]]
 name = "rustbox"