[auto] upd README TOC

Author: Anton-Latukha

README.md

@@ -6,6 +6,19 @@ Haskell parser, evaluator and type checker for the Nix language.
 
 <!-- TOC generates automatically, do not bother editing any further TOC text -->
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+
+
+- [Prerequisites](#prerequisites)
+- [Getting Started](#getting-started)
+- [Using the REPL](#using-the-repl)
+- [Cachix prebuild binary caches](#cachix-prebuild-binary-caches)
+- [Building](#building)
+  - [With benchmarks](#with-benchmarks)
+  - [With profiling](#with-profiling)
+  - [With full debug info](#with-full-debug-info)
+- [Contributing](#contributing)
+  - [Evaluating Nixpkgs with HNix](#evaluating-nixpkgs-with-hnix)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->