Godeps: update cheggaaa/pb to the latest version

[chriscool]

This reduces the number of race conditions found with:

make GOFLAGS=-race verbose=t deps t0090-get.sh

See #1012 (ipfs get race conditions) and #1323 (Revert "godeps: update everything to master").

License: MIT
Signed-off-by: Christian Couder chriscool@tuxfamily.org

[chriscool]

One of the Travis test failed with:

expecting success: 
        test_kill_repeat_10_sec $IPFS_PID

not ok 19 - 'ipfs daemon' can be killed
#   
#           test_kill_repeat_10_sec $IPFS_PID
#       

[chriscool]

Other Travis go tests failed with: No output has been received in the last ... minutes...

The circleci go tests failed with:

=== RUN TestLargeSwarm
race: limit on 8192 simultaneously alive goroutines is exceeded, dying
FAIL    github.com/ipfs/go-ipfs/exchange/bitswap    8.922s

[jbenet]

@chriscool

• i've seen that travis daemon kill problem. thoughts there?
• are the circleci tests running -race on everything?? shouldn't
• i'll merge this cause it's unrelated