crix-callgraph: add graphviz to required packages

Signed-off-by: Henri Rosten <henri.rosten@unikie.com>

Author: henrirosten

.travis.yml

@@ -44,6 +44,7 @@ matrix:
                   - llvm-10
                   - llvm-10-dev
                   - clang-format-10
+                  - graphviz
       python:
         - "3.6"
       before_install:
@@ -68,6 +69,7 @@ matrix:
                   - llvm-10
                   - llvm-10-dev
                   - clang-format-10
+                  - graphviz
       python:
         - "3.7"
       before_install:

safety-architecture/tools/callgraph-tool/README.md

@@ -16,7 +16,7 @@ CG_DIR=$(pwd)/workgroups/safety-architecture/tools/callgraph-tool
 Install the following requirements:
 ```
 sudo apt install python3 python3-pip build-essential cmake libstdc++-8-dev \
-clang-10 python3-clang-10 llvm-10 llvm-10-dev clang-format-10
+clang-10 python3-clang-10 llvm-10 llvm-10-dev clang-format-10 graphviz
 ```
 
 In addition, the scripts rely on python packages specified in requirements.txt. You can install the required packages with: