Add --locked flag to all install commands

Resolves: #331

README.md

@@ -19,7 +19,7 @@ _Please Note: This is a tool that we use (and like!) and it makes sense to us to
 ## [Quickstart](https://embarkstudios.github.io/cargo-deny/)
 
 ```bash
-cargo install cargo-deny && cargo deny init && cargo deny check
+cargo install --locked cargo-deny && cargo deny init && cargo deny check
 ```
 
 ## Usage
@@ -31,7 +31,7 @@ build `cargo-deny` with the `standalone` feature.
 This can be useful in Docker Images.
 
 ```bash
-cargo install cargo-deny
+cargo install --locked cargo-deny
 
 # Or, if you're an Arch user
 yay -S cargo-deny

docs/src/README.md

@@ -9,7 +9,7 @@ Installs cargo-deny, initializes your project with a default configuration,
 then runs all of the checks against your project.
 
 ```bash
-cargo install cargo-deny && cargo deny init && cargo deny check
+cargo install --locked cargo-deny && cargo deny init && cargo deny check
 ```
 
 ## Command Line Interface

docs/src/cli/README.md

@@ -37,7 +37,7 @@ Installing cargo-deny is relatively easy if you already have Rust and Cargo
 installed. You just have to type this snippet in your terminal:
 
 ```bash
-cargo install cargo-deny
+cargo install --locked cargo-deny
 ```
 
 This will fetch the source code for the latest release from
@@ -55,7 +55,7 @@ the latest bug-fixes and features, that will be released in the next version on
 version yourself.
 
 ```bash
-cargo install --git https://github.com/EmbarkStudios/cargo-deny cargo-deny
+cargo install --locked --git https://github.com/EmbarkStudios/cargo-deny cargo-deny
 ```
 
 Run `cargo deny help` in your terminal to verify if it works. Congratulations,

src/lib.rs

@@ -58,15 +58,15 @@
 //! ## [Quickstart](https://embarkstudios.github.io/cargo-deny/)
 //!
 //! ```bash
-//! cargo install cargo-deny && cargo deny init && cargo deny check
+//! cargo install --locked cargo-deny && cargo deny init && cargo deny check
 //! ```
 //!
 //! ## Usage
 //!
 //! ### [Install](https://embarkstudios.github.io/cargo-deny/cli/index.html) cargo-deny
 //!
 //! ```bash
-//! cargo install cargo-deny
+//! cargo install --locked cargo-deny
 //! ```
 //!
 //! ### [Initialize](https://embarkstudios.github.io/cargo-deny/cli/init.html) your project