fix for #160: avoid repeating self links in collections response (#161)

Resolves #160 (tests to be fixed in additional commit minutes from now).

pygeoapi/api.py

@@ -310,20 +310,20 @@ class API(object):
 
             fcm['collections'].append(collection)
 
-            fcm['links'].append({
-                'type': 'application/json',
-                'rel': 'self',
-                'title': 'This document as JSON',
-                'href': '{}/collections?f=json'.format(
-                    self.config['server']['url'])
-            })
-            fcm['links'].append({
-                'type': 'text/html',
-                'rel': 'alternate',
-                'title': 'This document as HTML',
-                'href': '{}/collections?f=html'.format(
-                    self.config['server']['url'])
-            })
+        fcm['links'].append({
+            'type': 'application/json',
+            'rel': 'self',
+            'title': 'This document as JSON',
+            'href': '{}/collections?f=json'.format(
+                self.config['server']['url'])
+        })
+        fcm['links'].append({
+            'type': 'text/html',
+            'rel': 'alternate',
+            'title': 'This document as HTML',
+            'href': '{}/collections?f=html'.format(
+                self.config['server']['url'])
+        })
 
         if format_ == 'html':  # render
             fcm['links'][0]['rel'] = 'alternate'