remove unneeded depencencies, update README

Cargo.toml

@@ -13,21 +13,17 @@ categories = ["aerospace", "aerospace::space-protocols", "no-std", "hardware-sup
 
 [dependencies]
 num = "0.4"
-serde = "1.0.137"
+serde = "1.0.142"
 zerocopy = "0.6.1"
 crc = "3.0.0"
 delegate = "0.7.0"
-chrono = "0.4.19"
-
-[dependencies.heapless]
-version = "0.7.14"
-optional = true
+chrono = "0.4.20"
 
 [dev-dependencies.postcard]
 version = "0.7.3"
 features = ["use-std"]
 
 [features]
-default = ["heapless", "alloc"]
+default = ["alloc"]
 std = ["postcard/use-std"]
 alloc = ["serde/alloc"]

README.md

@@ -11,3 +11,12 @@ Currently, this includes the following components:
   [CCSDS Blue Book 133.0-B-2](https://public.ccsds.org/Pubs/133x0b2e1.pdf)
 - PUS Telecommand and PUS Telemetry implementation according to the
   [ECSS-E-ST-70-41C standard](https://ecss.nl/standard/ecss-e-st-70-41c-space-engineering-telemetry-and-telecommand-packet-utilization-15-april-2016/).
+- CDS Short Time Code implementations according to
+  [CCSDS CCSDS 301.0-B-4](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
+
+This package is suitable for `no_std` environments.
+
+It features optional support for the `alloc` crate and also offers support
+for `serde`. The Space Paccket, PUS TM and TC implementations derive
+the `serde` `Serialize` and `Deserialize` trait. This allows serializing and
+deserializing them with an appropriate `serde` provider like `postcard`.