more MSRV fixes, pin clap at 3.0.0-beta.2

Cargo.lock

@@ -1,7 +1,5 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
-
 [[package]]
 name = "arrayvec"
 version = "0.5.2"
@@ -27,9 +25,9 @@ checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
 [[package]]
 name = "bitflags"
-version = "1.3.1"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2da1976d75adbe5fbc88130ecd119529cf1cc6a93ae1546d8696ee66f0d21af1"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
 [[package]]
 name = "byteorder"
@@ -298,9 +296,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "lexical-core"
-version = "0.7.5"
+version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "21f866863575d0e1d654fbeeabdc927292fdf862873dc3c96c6f753357e13374"
+checksum = "6607c62aa161d23d17a9072cc5da0be67cdfc89d3afb1e8d9c842bebc2525ffe"
 dependencies = [
  "arrayvec",
  "bitflags",

Cargo.toml

@@ -60,7 +60,8 @@ infer = { version = "0.5.0", optional = true }
 smartstring = "<= 0.2.7, >= 0.2.4"
 
 [dependencies.clap]
-version = "3.0.0-beta.2"
+# beta.4 requires rust >= 1.54.0 (and beta.3 was yanked)
+version = "=3.0.0-beta.2"
 default-features = false
 features = ["wrap_help", "color", "derive", "std"]