Update README.md

Author: sergei-mironov

README.md

@@ -24,7 +24,7 @@ installed to build the program.
 To build the program manually, unpack the tarball and cd to source directory.
 [Nix](http://nixos.org/nix) users may use `nix-shell` to enter the minimally
 sufficient development shell or `nix-build` to build the sources. Other
-distributions typically require the following commands to build in install the
+distributions typically require the following commands to build and install the
 program:
 
 ```sh