Add JSON support.

Cargo.lock

@@ -82,10 +82,18 @@ dependencies = [
 name = "htracker"
 version = "0.1.0"
 dependencies = [
+ "serde",
+ "serde_json",
  "structopt",
  "uuid",
 ]
 
+[[package]]
+name = "itoa"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "112c678d4050afce233f4f2852bb2eb519230b3cf12f33585275537d7e41578d"
+
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -176,6 +184,43 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3f6f92acf49d1b98f7a81226834412ada05458b7364277387724a237f062695"
+
+[[package]]
+name = "serde"
+version = "1.0.138"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1578c6245786b9d168c5447eeacfb96856573ca56c9d68fdcf394be134882a47"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.138"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "023e9b1467aef8a10fb88f25611870ada9800ef7e22afce356bb0d2387b6f27c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.82"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "82c2c1fdcd807d1098552c5b9a36e425e42e9fbd7c6a37a8425f390f781f7fa7"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "strsim"
 version = "0.8.0"