Update MSRV to 1.56.1

.github/workflows/rust.yml

@@ -54,7 +54,7 @@ jobs:
           - rust: stable
           - rust: beta
           - rust: nightly
-          - rust: 1.48
+          - rust: "1.56.1"
     steps:
       - name: Checkout Crate
         uses: actions/checkout@v2

README.md

@@ -1,6 +1,6 @@
 ![Build](https://github.com/rust-bitcoin/rust-miniscript/workflows/Continuous%20integration/badge.svg)
 
-**Minimum Supported Rust Version:** 1.48.0
+**Minimum Supported Rust Version:** 1.56.1
 
 # Miniscript
 
@@ -40,7 +40,8 @@ The cargo feature `std` is enabled by default. At least one of the features `std
 Enabling the `no-std` feature does not disable `std`. To disable the `std` feature you must disable default features. The `no-std` feature only enables additional features required for this crate to be usable without `std`. Both can be enabled without conflict.
 
 ## Minimum Supported Rust Version (MSRV)
-This library should always compile with any combination of features on **Rust 1.48.0**.
+
+This library should always compile with any combination of features on **Rust 1.56.1**.
 
 Some dependencies do not play nicely with our MSRV, if you are running the tests
 you may need to pin some dependencies. See `./contrib/test.sh` for current pinning.

clippy.toml

@@ -1,3 +1,3 @@
-msrv = "1.48.0"
+msrv = "1.56.1"
 # plan API returns Self as an error type for an large-ish enum
 large-error-threshold = 256

contrib/test.sh

@@ -20,19 +20,6 @@ then
     cargo fmt -- --check
 fi
 
-# Pin dependencies required to build with Rust 1.48.0
-if cargo --version | grep "1\.48\.0"; then
-    cargo update -p once_cell --precise 1.13.1
-    cargo update -p quote --precise 1.0.28
-    cargo update -p syn --precise 2.0.32
-    cargo update -p proc-macro2 --precise 1.0.63
-    cargo update -p serde_json --precise 1.0.99
-    cargo update -p serde --precise 1.0.152
-    cargo update -p log --precise 0.4.18
-    cargo update -p serde_test --precise 1.0.152
-    cargo update -p memchr --precise 2.5.0
-fi
-
 # Test bitcoind integration tests if told to (this only works with the stable toolchain)
 if [ "$DO_BITCOIND_TESTS" = true ]; then
     cd bitcoind-tests