Merge pull request #27 from s1lver/exclude_files

Remove unnecessary files from Composer package

Author: maks-rafalko

.gitattributes

@@ -14,3 +14,5 @@
 /phpunit.xml.dist       export-ignore
 /psalm.xml              export-ignore
 /psalm-baseline.xml     export-ignore
+/Makefile               export-ignore
+/composer.lock          export-ignore