Merge pull request #140 from johannesvollmer/johannesvollmer-be-readme

Update README.md

Author: johannesvollmer

README.md

@@ -55,6 +55,8 @@ __What we can do:__
         - [x] b44, b44a (huge thanks to @narann)
         - [ ] dwaa, dwab __(help wanted)__
 
+__Big-endian code is not yet fully implemented. Help wanted.__
+
 - Nice Things
     - [x] no unsafe code, no undefined behaviour
     - [x] no compiling C++, no configuring CMake,