Update MSRV to 1.60 to match log crate

.github/workflows/rust.yml

@@ -117,7 +117,7 @@ jobs:
         with:
           profile: minimal
           # when updating this, also update rust-version in Cargo.toml
-          toolchain: 1.31.0
+          toolchain: 1.60.0
           override: true
       - run: cargo build
       - run: cargo build --features reopen-1,reopen-03,meta-logging-in-format,syslog-3
@@ -134,7 +134,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.48.0
+          toolchain: 1.60.0
           override: true
       - run: cargo build --features date-based
   msrv_syslog_4:
@@ -150,7 +150,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.51.0
+          toolchain: 1.60.0
           override: true
       - run: cargo build --features syslog-4
   msrv_syslog_6:
@@ -166,7 +166,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.59.0
+          toolchain: 1.60.0
           override: true
       - run: cargo build --features syslog-6
   fmt_and_clippy:

Cargo.toml

@@ -5,7 +5,8 @@ version = "0.6.2"
 authors = ["David Ross <[email protected]>"]
 description = "Simple, efficient logging"
 edition = "2018"
-rust-version = "1.31"
+# when updating this, also update toolchain in .github/workflows/rust.yml
+rust-version = "1.60"
 
 documentation = "https://docs.rs/fern/"
 repository = "https://github.com/daboross/fern"