Refactor HTTP common code (#207)

- move to common/http.py,
- make fetch_url return a Response.

src/distrowatch.py

@@ -1,6 +1,7 @@
 import re
 import sys
 from bs4 import BeautifulSoup
+from common import http
 from common import endoflife
 from liquid import Template
 
@@ -27,8 +28,8 @@ def fetch_releases(distrowatch_id, regex, template):
     releases = {}
     l_template = Template(template)
     url = f"https://distrowatch.com/index.php?distribution={distrowatch_id}"
-    response = endoflife.fetch_url(url)
-    soup = BeautifulSoup(response, features="html5lib")
+    response = http.fetch_url(url)
+    soup = BeautifulSoup(response.text, features="html5lib")
     for table in soup.select("td.News1>table.News"):
         headline = table.select_one("td.NewsHeadline a[href]").get_text().strip()
         date = table.select_one("td.NewsDate").get_text()