message: Update README.md
  Add optional simplification step to overview
diff: @@ -48,11 +48,12 @@ The source files are organized in such a way that you don't need to change your
  When optimizing a mesh, you should typically feed it through a set of optimizations (the order is important!):
  1. Indexing
  -2. Vertex cache optimization
  -3. Overdraw optimization
  -4. Vertex fetch optimization
  -5. Vertex quantization
  -6. (optional) Vertex/index buffer compression
  +2. (optional, discussed last) Simplification
  +3. Vertex cache optimization
  +4. Overdraw optimization
  +5. Vertex fetch optimization
  +6. Vertex quantization
  +7. (optional) Vertex/index buffer compression
  ## Indexing
  