try travis again

Change-Id: I6a5960fa91c4380459173e42acac2b2720159dff
diff --git a/.travis.yml b/.travis.yml
index 88e7473..15e5888 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,39 +19,17 @@
   include:
     # Linux
     - env: COMPILER=g++-8
-      addons:
-        apt:
-          update: true
-          packages: boost1.72
     - env: COMPILER=clang++-5.0
-      addons:
-        apt:
-          update: true
-          packages: boost1.72
     - env: COMPILER=clang++-7
-      addons:
-        apt:
-          update: true
-          packages: boost1.72
     - env: COMPILER=clang++-8
-      addons:
-        apt:
-          update: true
-          packages: boost1.72
     - env: COMPILER=clang++-10
-      addons:
-        apt:
-          update: true
-          packages: boost1.72
     - env: COMPILER=clang++-11
-      addons:
-        apt:
-          update: true
-          packages: boost1.72
     - env: COMPILER=clang++-12
       addons:
         apt:
           update: true
+          sources:
+            - sourceline: 'ppa:mhier/libboost-latest'
           packages: boost1.72
 
     # macOS