refactor: use logger (#22)

Cargo.lock

@@ -293,11 +293,13 @@ dependencies = [
  "base64",
  "chrono",
  "clap",
+ "env_logger",
  "futures",
  "get_if_addrs",
  "headers",
  "hyper",
  "lazy_static",
+ "log",
  "md5",
  "mime_guess",
  "percent-encoding",
@@ -313,6 +315,16 @@ dependencies = [
  "uuid",
 ]
 
+[[package]]
+name = "env_logger"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b2cf0344971ee6c64c31be0d530793fba457d322dfec2810c453d0ef228f9c3"
+dependencies = [
+ "humantime",
+ "log",
+]
+
 [[package]]
 name = "event-listener"
 version = "2.5.2"
@@ -573,6 +585,12 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4a1e36c821dbe04574f602848a19f742f4fb3c98d40449f11bcad18d6b17421"
 
+[[package]]
+name = "humantime"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
+
 [[package]]
 name = "hyper"
 version = "0.14.19"