Merge #133: Feature gate import

64657da Feature gate import (Tobin C. Harding)

Pull request description:

  `Table` is only used if `test` or `std` - feature gate it.

  Fix: #130

ACKs for top commit:
  apoelstra:
    ACK 64657da; successfully ran local tests; lgtm

Tree-SHA512: 2adfde18086664645863cafdc7ba6336888a291d8266593c9e7646f25f5a29850b77682be68367b302f8fedbf2c28db9823e82c4a02acb90dcab52c8f4f22165

src/display.rs

@@ -30,7 +30,9 @@ use alloc::string::String;
 use core::borrow::Borrow;
 use core::fmt;
 
-use super::{Case, Table};
+use super::Case;
+#[cfg(any(test, feature = "std"))]
+use super::Table;
 use crate::buf_encoder::BufEncoder;
 
 /// Extension trait for types that can be displayed as hex.