raise MSRV to 1.60.0

This allows updating log and env_logger

.github/workflows/cargo-test.yml

@@ -29,10 +29,10 @@ jobs:
         run: if [[ ! -z `git status --porcelain=v1` ]]; then echo "::error::Workspace is dirty after running generator. Did you remember to check in the generated files?"; exit 1; fi
 
       - name: Install MSRV toolchain
-        run: rustup install 1.57.0 --profile minimal
+        run: rustup install 1.60.0 --profile minimal
 
       - name: Run cargo test
-        run: rustup run 1.57.0 cargo test
+        run: rustup run 1.60.0 cargo test
 
       - name: Install nightly toolchain
         run: |

Cargo.toml

@@ -12,12 +12,12 @@ readme = "README.md"
 
 [package.metadata]
 # Keep this at least 1 year old.
-msrv = "1.57.0" # Dec 2, 2021
+msrv = "1.60.0" # Apr 7, 2022
 
 [dependencies]
 atty = "0.2.14"
 base64 = "0.21"
-log = "0.4, <0.4.19" # 0.4.19 requires rustc 1.60
+log = "0.4"
 ring = "0.16"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
@@ -31,7 +31,7 @@ default-features = false
 features = ["tls"]
 
 [dev-dependencies]
-env_logger = "0.9"
+env_logger = "0.10"
 chrono = "0.4"
 parallel_reader = "0.1"
 threadpool = "1.8"