Python 3.3 has already been dropped (#4231)

README.rst

@@ -77,7 +77,7 @@ Requests is ready for today's web.
 - ``.netrc`` Support
 - Chunked Requests
 
-Requests officially supports Python 2.6–2.7 & 3.3–3.6, and runs great on PyPy.
+Requests officially supports Python 2.6–2.7 & 3.4–3.6, and runs great on PyPy.
 
 Installation
 ------------

requests/sessions.py

@@ -39,7 +39,7 @@ from .models import REDIRECT_STATI
 
 # Preferred clock, based on which one is more accurate on a given system.
 if platform.system() == 'Windows':
-    try:  # Python 3.3+
+    try:  # Python 3.4+
         preferred_clock = time.perf_counter
     except AttributeError:  # Earlier than Python 3.
         preferred_clock = time.clock