Run linter in root context

Author: gonzalocasas

tasks.py

@@ -123,7 +123,9 @@ def docs(ctx, doctest=False, rebuild=False, check_links=False):
 def lint(ctx):
     """Check the consistency of coding style."""
     log.write('Running flake8 python linter...')
-    ctx.run('flake8 src')
+
+    with chdir(BASE_FOLDER):
+        ctx.run('flake8 src')
 
 
 @task()