Merge #88: fix CI for recent serde update

35b84e4 pin serde for CI (Andrew Poelstra)

Pull request description:

  .

ACKs for top commit:
  tcharding:
    ACK 35b84e4

Tree-SHA512: c689ad3eab0bfdb17d3ad8101313f489a2d2e909e421fb0e66183d2406c03bfdc01a6d4f8919729fcb3c996504ba5fb7f64002d504da4e94b307a40d48f58c6e

Author: apoelstra

README.md

@@ -4,6 +4,17 @@
 
 This library is compatible with Rust **1.41.1** or higher.
 
+However, if you want to use the library with 1.41, you will need to pin a couple of
+our dependencies:
+
+```
+cargo update -p serde --precise 1.0.156
+cargo update -p syn --precise 1.0.107
+```
+
+before building. (And if your code is a library, your downstream users will need to
+run these commands, and so on.)
+
 # Rust JSONRPC Client
 
 Rudimentary support for sending JSONRPC 2.0 requests and receiving responses.

contrib/test.sh

@@ -14,10 +14,13 @@ fi
 # On MacOS on 1.41 we get a link failure with syn
 # This is fixed by https://github.com/rust-lang/rust/pull/91604 (I think)
 # but implies that we can't do testing on MacOS for now, at least with 1.41.
-if cargo --version | grep "1\.41\.0"; then
+if cargo --version | grep "1\.41"; then
     if [ "$RUNNER_OS" = "macOS" ]; then
         exit 0
     fi
+
+    cargo update -p serde --precise 1.0.156
+    cargo update -p syn --precise 1.0.107
 fi
 
 # Defaults / sanity checks