Update travis config to use Python 3.8.1 and CMake build system.

Author: DavidAntliff

.travis.yml

@@ -1,18 +1,6 @@
 dist: bionic
-env:
-  global:
-    # Set Python 3.7.1 as the default python
-    - PATH=/opt/python/3.7.1/bin:$PATH
-    - MAKEFLAGS="-j 2"
-
-language: bash
-
-addons:
-  apt:
-    packages:
-      - gperf
-      - python3
-      - python3-pip
+language: python
+python: "3.8"
 
 before_install:
   # Save path to the git respository
@@ -37,12 +25,9 @@ install:
   # Set the path to ESP-IDF directory
   - export IDF_PATH=~/esp/esp-idf
   # Install python dependencies
-  - pip install --user --requirement $IDF_PATH/requirements.txt
+  - pip install --requirement $IDF_PATH/requirements.txt
 
 script:
-  # Go back to the git repository
+  # Build project within the original repository
   - cd $PROJECT_PATH
-  # Update configuration so that kconfig doesn't start interactive mode
-  - make defconfig
-  # Build project from the git repository
-  - make
+  - $IDF_PATH/tools/idf.py build