added cargo build post-merge hook

README.md

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+# git hooks
+
+All of the files in this repository are licensed under the [GNU All-Permissive
+License](https://www.gnu.org/prep/maintain/html_node/License-Notices-for-Other-Files.html)

post-merge/cargo-build

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+#!/bin/sh
+
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice and this
+# notice are preserved.  This file is offered as-is, without any warranty.
+
+# Hook to compile Rust source files when they have been changed.
+
+for file in \
+	$(git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD |\
+	sed -n -e 's/src\///' -e 's/\.rs//p')
+do
+  cargo build --release --bin "$file"
+done