message: Update README.md
  `cmake` is required everywhere in order to build `expat-sys`
diff: @@ -86,7 +86,7 @@ command that should install all of them. If something is still found to be
  missing, please open an issue.
  ```sh
  -dnf install freetype-devel fontconfig-devel xclip
  +dnf install cmake freetype-devel fontconfig-devel xclip
  ```
  ##### openSUSE
  @@ -96,7 +96,7 @@ a `zypper` command that should install all of them. If something is
  still found to be missing, please open an issue.
  ```sh
  -zypper install freetype-devel fontconfig-devel xclip
  +zypper install cmake freetype-devel fontconfig-devel xclip
  ```
  ##### Void Linux
  