[docs, setup.py] cleaning up after bsddb3 removal

CHANGES.rst

@@ -1,6 +1,12 @@
 Changes
 =======
 
+2.0.0 (2021-09-20)
+------------------
+* drop Python 2 support
+* replace bsddb3 with Python's dbm for storing request data
+* [dev workflow] changed from Travis to Github Actions
+
 1.2.1 (2017-02-09)
 ------------------
 

README.rst

@@ -9,21 +9,16 @@ scrapy-deltafetch
   :target: https://codecov.io/gh/scrapy-plugins/scrapy-deltafetch
 
 This is a Scrapy spider middleware to ignore requests
-to pages containing items seen in previous crawls of the same spider,
-thus producing a "delta crawl" containing only new items.
+to pages seen in previous crawls of the same spider,
+thus producing a "delta crawl" containing only new requests.
 
 This also speeds up the crawl, by reducing the number of requests that need
 to be crawled, and processed (typically, item requests are the most CPU
 intensive).
 
-Requirements
-============
-
-DeltaFetch middleware depends on Python's bsddb3_ package.
-
-On Ubuntu/Debian, you may need to install ``libdb-dev`` if it's not installed already.
+DeltaFetch middleware uses Python's dbm_ package to store requests fingerprints.
 
-.. _bsddb3: https://pypi.python.org/pypi/bsddb3
+.. _dbm: https://docs.python.org/3/library/dbm.html
 
 
 Installation

setup.py

@@ -15,10 +15,12 @@
         'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
     ],
-    install_requires=['Scrapy>=1.1.0', 'bsddb3']
+    install_requires=['Scrapy>=1.1.0']
 )