diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..ac04ecc
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,6 @@
+.gitattributes export-ignore
+.github export-ignore
+.gitignore export-ignore
+.travis.yml export-ignore
+phpunit.xml export-ignore
+tests export-ignore
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 4e50f79..b2525a0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ php:
   - '7.0'
   - '7.1'
   - '7.2'
-  - nightly
+  - '7.3'
 
 # cache vendor dirs
 cache:
@@ -15,7 +15,7 @@ cache:
 
 install:
   - travis_retry composer self-update && composer --version
-  - travis_retry composer install --prefer-dist --no-interaction
+  - travis_retry composer install --no-interaction
 
 before_script:
   - sudo apt-get install p7zip-full