Updated requirements.txt to be more module-version resilliant.

Moved modules tied to specific versions higher, and modules with no restrictions lower.

requirements.txt

@@ -1,12 +1,17 @@
 colorama==0.3.9
-pyserial>=3,<=3.4
+urllib3[secure]==1.23
 prettytable==0.7.2
-Jinja2>=2.7.3,<=2.10
-intelhex>=1.3,<=2.2.1
 junit-xml==1.8
 pyyaml==4.2b1
-urllib3[secure]==1.23
+jsonschema==2.6.0
+future==0.16.0
+six==1.11.0
+mbed-cloud-sdk==2.0.1
 requests>=2.20,<2.21
+idna>=2,<2.8
+pyserial>=3,<=3.4
+Jinja2>=2.7.3,<=2.10
+intelhex>=1.3,<=2.2.1
 intervaltree>=2,<3
 mbed-ls>=1.5.1,<1.7
 mbed-host-tests>=1.1.2,<=1.5
@@ -14,10 +19,5 @@ mbed-greentea>=0.2.24,<=1.5
 beautifulsoup4>=4,<=4.6.3
 fuzzywuzzy>=0.11,<=0.17
 pyelftools>=0.24,<=0.25
-jsonschema==2.6.0
-future==0.16.0
-six==1.11.0
 git+https://github.com/armmbed/manifest-tool.git@v1.4.6
-mbed-cloud-sdk==2.0.1
-pyocd>=0.14,<0.15
 icetea>=1.0.2,<1.1