Update travis build

.travis.yml

@@ -4,9 +4,9 @@ python:
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install:
   - pip install arxiv2bib
-  - pip install tear-pages
   - pip install requesocks
   - pip install pyPDF2
+  - pip install tear-pages
   - pip install isbntools
   - pip install bibtexparser
   - pip install coveralls