Update exiftool version in travis config

Signed-off-by: Tom Van Herreweghe <tom@king-foo.be>

Author: Tom Van Herreweghe

.travis.yml

@@ -24,7 +24,7 @@ after_script:
 
 before_install:
   - composer self-update
-  - wget http://www.sno.phy.queensu.ca/~phil/exiftool/Image-ExifTool-9.82.tar.gz
-  - tar -zxvf Image-ExifTool-9.82.tar.gz
-  - cd Image-ExifTool-9.82 && perl Makefile.PL && make test && sudo make install
-  - cd .. && rm -rf Image-ExifTool-9.82
+  - wget http://www.sno.phy.queensu.ca/~phil/exiftool/Image-ExifTool-9.90.tar.gz
+  - tar -zxvf Image-ExifTool-9.90.tar.gz
+  - cd Image-ExifTool-9.90 && perl Makefile.PL && make test && sudo make install
+  - cd .. && rm -rf Image-ExifTool-9.90