Make pyocd dependency optional

Author: bridadan

setup.py

@@ -46,7 +46,6 @@ def read(fname):
     install_requires=[
         "PySerial>=3.0",
         "requests",
-        "pyocd==0.14.0",
         "intelhex",
         "future",
         "PrettyTable>=0.7.2",
@@ -58,5 +57,7 @@ def read(fname):
         "colorama>=0.3,<0.5",
     ],
     tests_require=["mock>=2", "pytest>=3"],
-    extras_require={"colorized_logs": ["colorlog"]},
+    extras_require={
+        "pyocd": ["pyocd==0.14.0"]
+    },
 )