Update .travis.yml

Author: Aathish04

.travis.yml

@@ -7,6 +7,7 @@ jobs:
       env: PYVER="3.6.10"
       install:
         - eval "$(/usr/libexec/path_helper)"
+        - sudo tlmgr update --self
         - sudo tlmgr install standalone preview doublestroke relsize fundus-calligra wasysym physics dvisvgm.x86_64-darwin dvisvgm rsfs wasy cm-super
         - pip3 install --upgrade pip
         - pip3 install -r ./.travis/travis-requirements.txt
@@ -21,6 +22,7 @@ jobs:
       env: PYVER="3.7.7"
       install:
         - eval "$(/usr/libexec/path_helper)"
+        - sudo tlmgr update --self
         - sudo tlmgr install standalone preview doublestroke relsize fundus-calligra wasysym physics dvisvgm.x86_64-darwin dvisvgm rsfs wasy cm-super
         - pip3 install --upgrade pip
         - pip3 install -r ./.travis/travis-requirements.txt
@@ -35,6 +37,7 @@ jobs:
       env: PYVER="3.8.0" # Using Python 3.8.0 due to error with rich
       install:
         - eval "$(/usr/libexec/path_helper)"
+        - sudo tlmgr update --self
         - sudo tlmgr install standalone preview doublestroke relsize fundus-calligra wasysym physics dvisvgm.x86_64-darwin dvisvgm rsfs wasy cm-super
         - pip3 install --upgrade pip
         - pip3 install -r ./.travis/travis-requirements.txt