Fix typo

Author: Kazuma TAKAOKA

.travis.yml

@@ -2,7 +2,7 @@ language: java
 jdk: oraclejdk8
 sudo: false
 before_install:
-  - if [ -n "$encrypted_7726a8800684_key" ]; then openssl aes-256-cbc -K $encrypted_7726a8800684_key -iv $encrypted_7726a8800684_iv -in .travis/settings_signing.xml.tar -out .travis/settings_signing.tar -d; tar xf .travis/settings_signing.tar -C .travis; fi
+  - if [ -n "$encrypted_7726a8800684_key" ]; then openssl aes-256-cbc -K $encrypted_7726a8800684_key -iv $encrypted_7726a8800684_iv -in .travis/settings_signing.tar.enc -out .travis/settings_signing.tar -d; tar xf .travis/settings_signing.tar -C .travis; fi
 dd:
   - if [ -f .travis/signingkey.asc ]; then gpg --fast-import .travis/signingkey.asc; fi
 install: true