docs: remove redundant cargo build step from README (#16)

README.md

@@ -18,7 +18,7 @@ As [Justin Drake talks about it](https://youtu.be/SwonTtOQzAk), I think the righ
 
 ![Nova Scotia](https://user-images.githubusercontent.com/6984346/201644973-fb084b6c-3807-4bf4-99bf-a1461271f1b5.png)
 
-To use it yourself, install this branch of [Circom](https://docs.circom.io) which adds support for the [Pasta Curves](https://electriccoin.co/blog/the-pasta-curves-for-halo-2-and-beyond/) to the C++ witness generator: [nalinbhardwaj/pasta](https://github.com/nalinbhardwaj/circom/tree/pasta). To install this branch, clone the git repo (using `git clone https://github.com/nalinbhardwaj/circom.git && git checkout pasta`). Then build and install the `circom` binary by running `cargo build --release && cargo install --path circom`. This will overwrite any existing `circom` binary. Refer to the [Circom documentation](https://docs.circom.io/getting-started/installation/#installing-dependencies) for more information.
+To use it yourself, install this branch of [Circom](https://docs.circom.io) which adds support for the [Pasta Curves](https://electriccoin.co/blog/the-pasta-curves-for-halo-2-and-beyond/) to the C++ witness generator: [nalinbhardwaj/pasta](https://github.com/nalinbhardwaj/circom/tree/pasta). To install this branch, clone the git repo (using `git clone https://github.com/nalinbhardwaj/circom.git && git checkout pasta`). Then build and install the `circom` binary by running `cargo install --path circom`. This will overwrite any existing `circom` binary. Refer to the [Circom documentation](https://docs.circom.io/getting-started/installation/#installing-dependencies) for more information.
 
 Note that if you are interested in generating and verifying proofs in browsers, you must use the WASM witness generator. We will describe in-browser proving and verification later in the README.