no longer needed specific version

Author: Hana Dusíková

.travis.yml

@@ -14,7 +14,7 @@ jobs:
       - CONAN_GCC_VERSIONS=8
       - CONAN_DOCKER_IMAGE=lasote/conangcc8
     install:
-       - pip install -U "conan<1.30" conan-package-tools
+       - pip install -U conan conan-package-tools
     script:
       - python .conan/build.py