Fix CI (update texlive)

.drone.yml

@@ -6,6 +6,7 @@ pipeline:
   build:
     image:       registry.maggioni.xyz/praticamentetilde/latex:2018-small
     commands:
+      - tlmgr update --self --all
       - tlmgr install blindtext koma-script float hyperref pgf biblatex
       - tlmgr install pgfgantt listings collection-fontsrecommended comment  
       - tlmgr install biber babel-italian babel-english hyphen-italian
@@ -24,3 +25,4 @@ pipeline:
     endpoint: https://s3.maggioni.xyz
 
 branches:        master
+ tlmgr update --self