Merge #60: CI: pin byteorder to 1.4.3

9afa79c readme: update MSRV pinning instructions (Riccardo Casatta)
275da64 ci: remove old MSRV pinnings (Riccardo Casatta)
dab0108 fuzz: pin byteorder to 1.4.3 (Riccardo Casatta)
b90f8f9 CI: pin byteorder to 1.4.3 (Riccardo Casatta)

Pull request description:

ACKs for top commit:
  LeoComandini:
    utACK 9afa79c
  apoelstra:
    ACK 9afa79c

Tree-SHA512: 3a309a9d9b069bf45d1c130c1daabf5cba127f2a4ed4b1e508d068e6f5fbdce338f2cbd79127e9b120375232a2589ffb9398307099c15b00c6f3ae474ddab4eb

Author: apoelstra

README.md

@@ -47,9 +47,12 @@ Some dependencies do not play nicely with our MSRV, if you are running the tests
 you may need to pin as follows:
 
 ```
-cargo update -p serde --precise 1.0.156
+cargo update -p byteorder --precise 1.4.3
 ```
 
+Note this list could sometimes be not exhaustive because not enforced by CI. 
+If you have any issues check the script executed in CI: `contrib/test.sh`
+
 ## Contributing
 Contributions are generally welcome. If you intend to make larger changes please
 discuss them in an issue before PRing them to avoid duplicate work and

contrib/test.sh

@@ -9,11 +9,7 @@ rustc --version
 
 # Pin dependencies required to build with Rust 1.58
 if cargo --version | grep "1\.58"; then
-    cargo update -p serde_json --precise 1.0.99
-    cargo update -p serde --precise 1.0.156
-    cargo update -p quote --precise 1.0.30
-    cargo update -p proc-macro2 --precise 1.0.63
-    cargo update -p serde_test --precise 1.0.152
+    cargo update -p byteorder --precise 1.4.3
 fi
 
 # Format if told to

fuzz/fuzz.sh

@@ -18,6 +18,8 @@ fi
 cargo --version
 rustc --version
 
+cargo update -p byteorder --precise 1.4.3
+
 # Testing
 cargo install --force honggfuzz --no-default-features
 for targetFile in $targetFiles; do