Added missing trailing shashes

Closes #65

Author: GrahamCampbell

src/Api/Repositories/Workspaces/Environments.php

@@ -31,7 +31,7 @@ class Environments extends AbstractWorkspacesApi
      */
     public function list(array $params = [])
     {
-        $uri = $this->buildEnvironmentsUri();
+        $uri = UriBuilder::appendSeparator($this->buildEnvironmentsUri());
 
         return $this->get($uri, $params);
     }
@@ -60,7 +60,7 @@ public function show(string $env, array $params = [])
      */
     public function create(array $params = [])
     {
-        $uri = $this->buildEnvironmentsUri();
+        $uri = UriBuilder::appendSeparator($this->buildEnvironmentsUri());
 
         return $this->post($uri, $params);
     }