Upgrade pip to avoid kombu dependency error

[ellisms]

Issue #, if available:
Issue 297: dependency error with kombu.

#0 8.992 ERROR: Could not find a version that satisfies the requirement kombu<6.0,>=5.3.0 (from celery[sqs]) (from versions: 0.1.0, 0.2.0, 0.9.0, 0.9.1, 0.9.2, 0.9.4, 0.9.5, 0.9.6, 0.9.7, 1.0.0b1, 1.0.0b2, 1.0.0b3, 1.0.0b4, 1.0.0rc1, 1.0.0rc2, 1.0.0rc3, 1.0.0rc4, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.1.5, 1.1.6, 1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.4.0, 1.4.1, 1.4.2, 1.4.3, 1.5.0, 1.5.1, 2.0.0, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.1.6, 2.1.7, 2.1.8, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.2.6, 2.3.0, 2.3.1, 2.3.2, 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, 2.4.7, 2.4.8, 2.4.9, 2.4.10, 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.5.4, 2.5.5, 2.5.6, 2.5.7, 2.5.8, 2.5.9, 2.5.10, 2.5.11, 2.5.12, 2.5.13, 2.5.14, 2.5.15, 2.5.16, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 3.0.10, 3.0.11, 3.0.12, 3.0.13, 3.0.14, 3.0.15, 3.0.16, 3.0.17, 3.0.18, 3.0.19, 3.0.20, 3.0.21, 3.0.22, 3.0.23, 3.0.24, 3.0.25, 3.0.26, 3.0.27, 3.0.28, 3.0.29, 3.0.30, 3.0.31, 3.0.32, 3.0.33, 3.0.34, 3.0.35, 3.0.36, 3.0.37, 4.0.0rc3, 4.0.0rc4, 4.0.0rc5, 4.0.0rc6, 4.0.0, 4.0.1, 4.0.2, 4.1.0, 4.2.0, 4.2.1, 4.2.2.post1, 4.3.0, 4.4.0, 4.5.0, 4.6.0, 4.6.1, 4.6.2, 4.6.3, 4.6.4, 4.6.5, 4.6.6, 4.6.7, 4.6.8, 4.6.9, 4.6.10, 4.6.11, 5.0.0, 5.0.1, 5.0.2, 5.1.0b1, 5.1.0, 5.2.0rc1, 5.2.0, 5.2.1, 5.2.2, 5.2.3, 5.2.4, 5.3.0a1, 5.3.0b1, 5.3.0b2, 5.3.0b3) #0 8.992 ERROR: No matching distribution found for kombu<6.0,>=5.3.0 (from celery[sqs])

Description of changes:
Perform pip upgrade before installing dependencies.

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