Upgrade to Rust 1.48.0 in rust-toolchain

A severe performance regression with `async fn` was fixed in 1.48.0, which greatly improves compilation times on many people's machines. rust-lang/rust#78410 As such, we bump the `rust-toolchain` file to 1.48.0 stable for a smoother developer experience, even if 1.46.0 is still technically supported features-wise.
ebkalderon · Nov 27, 2020 · 43833df · 43833df
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diff --git a/README.md b/README.md
@@ -6,8 +6,8 @@ container engine.
 ## Getting started
 
 To build this project on Linux, you will need the latest version of the
-[Rust toolchain](https://www.rust-lang.org/) (at least version 1.46.0, as
-provided with the `rust-toolchain` file).
+[Rust toolchain](https://www.rust-lang.org/) (at least version 1.46.0, but
+1.48.0 compiles async code faster, as provided in the `rust-toolchain` file).
 
 The following binaries will also need to be available in `$PATH`:
 

diff --git a/rust-toolchain b/rust-toolchain
@@ -1 +1 @@
-1.46.0
+1.48.0