fix: Install pexpect to fix failing regen_headers.sh
#87
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While following the linux build directions in `BUILD.md`, the script `scripts/regen_headers.sh` fails to generate DroneCAN headers due to a missing python module:
```
Generating DroneCAN headers for libcanard
Traceback (most recent call last):
File "/flash/arduremoteid/modules/dronecan_dsdlc/dronecan_dsdlc.py", line 20, in <module>
from dronecan_dsdlc_tester import *
File "/flash/arduremoteid/modules/dronecan_dsdlc/dronecan_dsdlc_tester.py", line 12, in <module>
import pexpect
ModuleNotFoundError: No module named 'pexpect'
./scripts/regen_headers.sh: line 16: cd: libraries/DroneCAN_generated: No such file or directory
./scripts/regen_headers.sh: line 16: cd: libraries/DroneCAN_generated: No such file or directory
./scripts/regen_headers.sh: line 16: cd: libraries/DroneCAN_generated: No such file or directory
./scripts/regen_headers.sh: line 16: cd: libraries/DroneCAN_generated: No such file or directory
./scripts/regen_headers.sh: line 16: cd: libraries/DroneCAN_generated: No such file or directory
./scripts/regen_headers.sh: line 16: cd: libraries/DroneCAN_generated: No such file or directory
./scripts/regen_headers.sh: line 16: cd: libraries/DroneCAN_generated: No such file or directory
./scripts/regen_headers.sh: line 16: cd: libraries/DroneCAN_generated: No such file or directory
./scripts/regen_headers.sh: line 16: cd: libraries/DroneCAN_generated: No such file or directory
```
This issue is resolved (and build completed successfully) following a `pip install pexpect`.
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While following the linux build directions in
BUILD.md, the scriptscripts/regen_headers.shfails to generate DroneCAN headers due to a missing python module:This issue is resolved (and build completed successfully) following a
pip install pexpect.