Update to nightly-2020-12-01

Author: JohnTitor

README.md

@@ -27,13 +27,13 @@ repository and compiled from source or installed from
 of the nightly toolchain is supported at any given time.
 
 <!-- NOTE: Keep in sync with nightly date on rust-toolchain. -->
-It's recommended to use `nightly-2020-11-19` toolchain.
-You can install it by using `rustup install nightly-2020-11-19` if you already have rustup.
+It's recommended to use `nightly-2020-12-01` toolchain.
+You can install it by using `rustup install nightly-2020-12-01` if you already have rustup.
 Then you can do:
 
 ```sh
-$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2020-11-19
-$ cargo +nightly-2020-11-19 install semverver
+$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2020-12-01
+$ cargo +nightly-2020-12-01 install semverver
 ```
 
 You'd also need `cmake` for some dependencies, and a few common libraries (if you hit
@@ -43,8 +43,8 @@ can be added here).
 You can also install the newest version of the tool from git:
 
 ```sh
-$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2020-11-19
-$ cargo +nightly-2020-11-19 install --git https://github.com/rust-lang/rust-semverver
+$ rustup component add rustc-dev llvm-tools-preview --toolchain nightly-2020-12-01
+$ cargo +nightly-2020-12-01 install --git https://github.com/rust-lang/rust-semverver
 ```
 
 <details>

rust-toolchain

@@ -1,4 +1,4 @@
 # NOTE: Keep in sync with nightly date on README
 [toolchain]
-channel = "nightly-2020-11-19"
+channel = "nightly-2020-12-01"
 components = ["llvm-tools-preview", "rustc-dev"]