updated .gitignore to remove .pickle
updated .gitignore to remove .pickle

dcbdmb/example-code,Wallace-dyfq/example-code,everaldo/example-code,everaldo/example-code,oxfordyang2016/learnfluentpython,friebsch/example-code,Wallace-dyfq/example-code,oxfordyang2016/learnfluentpython,Wallace-dyfq/example-code,dcbdmb/example-code,fluentpython/example-code,Wallace-dyfq/example-code,oxfordyang2016/learnfluentpython,friebsch/example-code,friebsch/example-code,everaldo/example-code,friebsch/example-code,oxfordyang2016/learnfluentpython,Wallace-dyfq/example-code,everaldo/example-code,everaldo/example-code,dcbdmb/example-code,oxfordyang2016/learnfluentpython,dcbdmb/example-code,dcbdmb/example-code,fluentpython/example-code,friebsch/example-code,fluentpython/example-code,fluentpython/example-code,fluentpython/example-code