update readme dev

Author: MegamindHenry

README_dev.md

@@ -118,4 +118,5 @@ To make docs, run `make.jl` in the docs dir and you can test/verify that docs lo
 3. test test units
 4. upgrade version in Project.tmol
 5. push commits online, wait for CI
-6. release a new version on git
+6. add a comment in register issue, "@JuliaRegistrator register" to register in Julia registry.
+7. a new release will be generated by TagBot