This issue is collecting some ideas for breaking API changes that we might want to make in the future

• Convert some fields from Option<T> to T if they were added in very old kernels (Consider only making fields optional if they were added after Linux 2.6 #68)
• Remove stat and pid fields from the Process struct to support cases when you don't need this information (Decouple /stat reading from the Process constructor #60)
• Remove some deprecated methods (more consistent function naming style #52)
• Returning ticks in CpuTime (Returning ticks in CpuTime #76)