Remove yew-validation from yew dependencies (#1496)

Author: jstarry

yew/Cargo.toml

@@ -42,7 +42,6 @@ toml = { version = "0.5", optional = true }
 wasm-bindgen = { version = "0.2.60", optional = true }
 wasm-bindgen-futures = { version = "0.4", optional = true }
 yew-macro = { version = "0.17.0", path = "../yew-macro" }
-yew-validation = { version = "0.1.0", path = "../yew-validation" }
 
 [dependencies.web-sys]
 version = "0.3"