Fix git hooks.

cmd/split-ynab/main.go

@@ -19,7 +19,10 @@ func main() {
 		fmt.Printf("failed to initialize logger: %v", err)
 		os.Exit(1)
 	}
-	defer logger.Sync()
+	defer func() {
+		// If this fails there's not much to do about it. This is mostly here to appease the linter.
+		_ = logger.Sync()
+	}()
 
 	f, err := os.Open(configFile)
 	if err != nil {

githooks/README.md

@@ -0,0 +1,8 @@
+Install by running:
+
+```
+git config core.hooksPath contrib/githooks
+```
+
+From root directory.
+

githooks/pre-commit.sh → githooks/pre-commit

@@ -1,5 +1,6 @@
-#!/bin/sh
+#!/bin/bash
+
+set -e
 
 golangci-lint run ./...
 go mod tidy && git add go.mod go.sum
-

githooks/pre-push

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -e
+
+go test ./...