Make releasedata.Product usable in 'with' expression (#294)

This way the writing of the JSON file is handled automatically if the update does not fail.
It pave the way to further global improvements, such as a better error handling.

src/rds.py

@@ -16,20 +16,18 @@ PRODUCTS = {
 VERSION_REGEX = re.compile(r"(?P<version>\d+(?:\.\d+)*)", flags=re.IGNORECASE)  # https://regex101.com/r/BY1vwV/1
 
 for product_name, url in PRODUCTS.items():
-    product = releasedata.Product(product_name)
-    response = http.fetch_url(url)
-    soup = BeautifulSoup(response.text, features="html5lib")
+    with releasedata.ProductData(product_name) as product_data:
+        response = http.fetch_url(url)
+        soup = BeautifulSoup(response.text, features="html5lib")
 
-    for table in soup.find_all("table"):
-        for row in table.find_all("tr"):
-            columns = row.find_all("td")
-            if len(columns) <= 3:
-                continue
+        for table in soup.find_all("table"):
+            for row in table.find_all("tr"):
+                columns = row.find_all("td")
+                if len(columns) <= 3:
+                    continue
 
-            version_match = VERSION_REGEX.search(columns[0].text.strip())
-            if version_match:
-                version = version_match.group("version")
-                date = dates.parse_date(columns[2].text)
-                product.declare_version(version, date)
-
-    product.write()
+                version_match = VERSION_REGEX.search(columns[0].text.strip())
+                if version_match:
+                    version = version_match.group("version")
+                    date = dates.parse_date(columns[2].text)
+                    product_data.declare_version(version, date)