main.py: fix inside_vimwiki_link for markdown syntax

Vimwiki using markdown syntax are not detecting the link syntax, therefor
instead of VimwikiFollowLink command call it will TaskwikiInfo

taskwiki/main.py

@@ -301,7 +301,18 @@ def task_info_or_vimwiki_follow_link():
             column <= line.find(']]') + 1
         ])
 
-        if inside_vimwiki_link:
+        # Detect if the cursor stands on a vimwiki markdown syntax link,
+        # if so, trigger it
+        inside_vimwiki_md_link = all([
+            '[' in line,
+            ']' in line,
+            '(' in line,
+            ')' in line,
+            column >= line.find('['),
+            column <= line.find(']') + 1
+        ])
+
+        if inside_vimwiki_link or inside_vimwiki_md_link:
             vim.command('VimwikiFollowLink')
             return