sdl: Update TODO.md for SDL2 2.0.7
+## 2.0.7
+
+### General
+
+Audio
+
+- [x] SDL_NewAudioStream
+- [x] SDL_AudioStreamPut
+- [x] SDL_AudioStreamGet
+- [x] SDL_AudioStreamAvailable
+- [x] SDL_AudioStreamFlush
+- [x] SDL_AudioStreamClear
+- [x] SDL_FreeAudioStream
+
+Joystick
+
+- [x] SDL_LockJoysticks()
+- [x] SDL_UnlockJoysticks()
+
+Stdinc
+
+- [ ] SDL_GetMemoryFunctions()
+- [ ] SDL_SetMemoryFunctions()
+- [ ] SDL_GetNumAllocations()
+
## 2.0.6
### General
