Fix CI error (#20)

Author: boltomli

.travis.yml

@@ -17,9 +17,9 @@ install:
   - sudo bash install-tl.sh
   - source ~/.bash_profile
   - export TLMGR=`which tlmgr`
-  - sudo $TMLGR install letltxmacro
   # update texlive
   - sudo $TLMGR update --self --all
+  - sudo $TLMGR install letltxmacro
 
 script:
   - make html