Fix tons of warnings in newest nightly (#2784)

* Fix tons of warnings in newest nightly

* Fix sr-api-macro doc tests

substrate/core/sr-primitives/src/generic/mod.rs

@@ -44,8 +44,8 @@ use rstd::prelude::*;
 fn encode_with_vec_prefix<T: Encode, F: Fn(&mut Vec<u8>)>(encoder: F) -> Vec<u8> {
 	let size = ::rstd::mem::size_of::<T>();
 	let reserve = match size {
-		0...0b00111111 => 1,
-		0...0b00111111_11111111 => 2,
+		0..=0b00111111 => 1,
+		0..=0b00111111_11111111 => 2,
 		_ => 4,
 	};
 	let mut v = Vec::with_capacity(reserve + size);