Merge #107: Remove unnecessary attribution

cd652b8 Remove unnecessary attribution (Tobin C. Harding)

Pull request description:

  As we discussed in rust-bitcoin recently the "written by" attribute is not that valuable because:

  - It is not really true because many devs contribute to a file
  - The 'by rust bitcoin devs' adds zero information

  Remove the unnecessary attribution for all files in the `primitives` module. Leave the `lib.rs` attribution as
  ```
      // Written by Clark Moody and the rust-bitcoin developers.
  ```
  because Clark wrote the library initially and the rust-bitcoin devs came along and hacked the s**t out of it, keep the attribution to give recognition to Clark and to assume accountability by the rust-bitcoin devs (well that's how I read it anyways).

ACKs for top commit:
  clarkmoody:
    ACK cd652b8

Tree-SHA512: ac6a83fb7b6d76809738a23b166f3566814deb226a0a771219015895388599e9e4f1930b0cc49c0b9496862ed8e1037483ed3ab8ea2b84dadf66f783d20563f2

Author: apoelstra

src/primitives/gf32.rs

@@ -1,5 +1,3 @@
-// Written by the Andrew Poelstra and the rust-bitcoin developers.
-// (Replacing very similar code originally written by Clark Moody.)
 // SPDX-License-Identifier: MIT
 
 //! GF32 - Galois Field over 32 elements.

src/primitives/mod.rs

@@ -1,4 +1,3 @@
-// Written by the rust-bitcoin developers.
 // SPDX-License-Identifier: MIT
 
 //! Provides the internal nuts and bolts that enable bech32 encoding/decoding.