Update cargo

Cargo.lock

@@ -310,7 +310,7 @@ dependencies = [
  "crypto-hash",
  "curl",
  "curl-sys",
- "env_logger 0.7.1",
+ "env_logger 0.8.1",
  "filetime",
  "flate2",
  "fwdansi",
@@ -1035,6 +1035,19 @@ dependencies = [
  "termcolor",
 ]
 
+[[package]]
+name = "env_logger"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54532e3223c5af90a6a757c90b5c5521564b07e5e7a958681bcd2afad421cdcd"
+dependencies = [
+ "atty",
+ "humantime 2.0.1",
+ "log",
+ "regex",
+ "termcolor",
+]
+
 [[package]]
 name = "error_index_generator"
 version = "0.0.0"