README: remove go-re2 section

It is not used anymore.

gopasta/README.md

@@ -40,27 +40,6 @@ for the given Go version and this package version.
 The binary is self-contained, so if needed you can move it to another machine
 with the same OS and CPU architecture and run there.
 
-### Using C++ RE2
-
-If you send a one time link in some chat (e.g. discord), its crawler will try to
-load link preview and would [expire the link][issue8], if not the protection
-that we have. The crawlers are detected and blocked in one-time links, so they
-do not expire. Regular expressions matching against all the crawlers User Agent
-strings is done using [go-re2](https://github.com/wasilibs/go-re2) library which
-is very fast. To make this matching even faster (~3 times), you can build
-against C++ version of RE2 library:
-
-```
-sudo apt-get install libre2-dev
-sudo apt-get install build-essential pkg-config
-go build -trimpath -ldflags="-s -w -buildid=" -tags re2_cgo -o gopasta
-```
-
-The library is linked dynamically, so it has to be installed on the system
-on which it is run.
-
-[issue8]: https://github.com/starius/pasta/issues/8
-
 ## Run it on server
 
 First generate encryption password: