Correct command calls

Author: AA-Turner

.travis.yml

@@ -24,37 +24,37 @@ jobs:
     # Tests build on 3.7-dev
     - name: "3.7-dev Build Test"
       python: 3.7-dev
-      env: COMMAND="./build.py"
+      env: COMMAND="python3 ./build.py"
 
     # Tests build on 3.8
     - name: "3.8 Build Test"
       python: 3.8
-      env: COMMAND="./build.py"
+      env: COMMAND="python3 ./build.py"
 
     # Tests build on 3.8-dev
     - name: "3.8-dev Build Test"
       python: 3.8-dev
-      env: COMMAND="./build.py"
+      env: COMMAND="python3 ./build.py"
 
     # Tests build with Fail on Warning
     - name: "3.8 Fail on Warning"
       python: 3.8
       env:
-        - COMMAND="./build.py -f"
+        - COMMAND="python3 ./build.py -f"
         - FAIL_ALLOWED=true
 
     # Tests build with Fail on Warning (Nitpicky)
     - name: "3.8 Fail on Warning Nitpicky"
       python: 3.8
       env:
-        - COMMAND="./build.py -f -n"
+        - COMMAND="python3 ./build.py -f -n"
         - FAIL_ALLOWED=true
 
     # Checks link references within PEPs
     - name: "3.8 Check Links"
       python: 3.8
       env:
-        - COMMAND="./build.py -c"
+        - COMMAND="python3 ./build.py -c"
         - FAIL_ALLOWED=true
 
   allow_failures: