refactor(lib): remove build script features since minimum version is higher

build.rs

@@ -1,13 +0,0 @@
-extern crate rustc_version;
-use rustc_version::{version, Version};
-
-fn main() {
-    // Check for a minimum version to see if new rust features can be used
-    let version = version().unwrap();
-    if version >= Version::parse("1.26.0").unwrap() {
-        println!("cargo:rustc-cfg=__hyper_impl_trait_available");
-    }
-    if version >= Version::parse("1.23.0").unwrap() {
-        println!("cargo:rustc-cfg=__hyper_inherent_ascii");
-    }
-}