requirements: Add line_profiler.

This library is super useful for doing line-by-line profiling of code
paths that we want to be really fast.

requirements/common.in

@@ -78,6 +78,9 @@ httplib2==0.12.0
 # Needed for hipchat import
 hypchat==0.21
 
+# For doing highly usable Python profiling
+line_profiler==2.1.2
+
 # Needed for inlining the CSS in emails
 premailer==3.2.0
 

requirements/dev.txt

@@ -90,6 +90,7 @@ jinja2==2.10
 jmespath==0.9.3           # via boto3, botocore
 jsondiff==1.1.1           # via moto
 jsonpickle==1.1           # via aws-xray-sdk, python-digitalocean
+line_profiler==2.1.2
 lxml==4.3.0
 markdown-include==0.5.1
 markdown==3.0.1

requirements/prod.txt

@@ -64,6 +64,7 @@ ipython-genutils==0.2.0   # via traitlets
 ipython==6.5.0
 jedi==0.13.2              # via ipython
 jinja2==2.10
+line_profiler==2.1.2
 lxml==4.3.0
 markdown-include==0.5.1
 markdown==3.0.1