Just use requirements.txt from top level directory.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

environment.yml

diff --git a/environment.yml b/environment.yml
index c099164..336dad0 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,5 +6,4 @@
   - symbiflow-yosys
   - pip
   - pip:
-    - tox
-    - flake8
+    - -r requirements.txt

requirements.txt

diff --git a/requirements.txt b/requirements.txt
index a23fd97..27481cc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,7 @@
 docutils
 lxml
 pyjson
+pylint
+tox
+
 -e git://github.com/SymbiFlow/vtr-xml-utils#egg=vtr-xml-utils