Fix travis file.

Author: kovacsv

.travis.yml

@@ -32,16 +32,6 @@ matrix:
       env:
         - MATRIX_EVAL="CC=gcc-9 && CXX=g++-9"
         - PACKAGE_NAME=Linux_gcc9
-    - os: linux
-      addons:
-        apt:
-          sources:
-            - ubuntu-toolchain-r-test
-          packages:
-            - g++-10
-      env:
-        - MATRIX_EVAL="CC=gcc-10 && CXX=g++-10"
-        - PACKAGE_NAME=Linux_gcc10
     - os: linux
       addons:
         apt:
@@ -82,7 +72,7 @@ matrix:
             - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main'
               key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
           packages:
-            - clang-9
+            - clang-10
       env:
         - MATRIX_EVAL="CC=clang-10 && CXX=clang++-10"
         - PACKAGE_NAME=Linux_clang10