message: fix(button): support text wrap
  Fixes
diff: //
  -// Copyright IBM Corp. 2019
  +// Copyright IBM Corp. 2019, 2020
  //
  // This source code is licensed under the Apache-2.0 license found in the
  // LICENSE file in the root directory of this source tree.
  @@ -16,7 +16,7 @@ $css--plex: true !default;
  .#{$prefix}--btn {
  flex-grow: 1;
  - max-width: none;
  + max-width: 100%;
  }
  .#{$prefix}-ce--btn--has-icon {
  