fix typo

.travis.yml

@@ -27,7 +27,7 @@ before_install:
   - docker run -d -h kdc.test.gokrb5 -v /etc/localtime:/etc/localtime:ro -p 98:88 -p 98:88/udp --name krb5kdc-latest jcmturner/gokrb5:kdc-latest
   - docker run -d --add-host host.test.gokrb5:127.0.0.88 -v /etc/localtime:/etc/localtime:ro -p 80:80 -p 443:443 --name gokrb5-http jcmturner/gokrb5:http
 
-before_stript:
+before_script:
   - sudo sed -i 's/nameserver .*/nameserver 127.0.0.1/g' /etc/resolv.conf
 
 env: