Bump mem and yargs in /wasm

[dependabot]

Bumps mem and yargs. These dependencies needed to be updated together.
Updates mem from 1.1.0 to 4.0.0

Commits

• 159369f 4.0.0
• da4e439 Automatically release memory when an item expires - fixes #14 (#19)
• a90ebb8 Performance enhancements (#18)
• 77874ca Require Node.js 6
• 16ff264 3.0.1
• cd6320a Delete cache entries older than max age (#16)
• 74439cc 3.0.0
• 2189e3c Cache pending promises (#12)
• 009ce6a 2.0.0
• 40ea5ab Meta tweaks
• Additional commits viewable in compare view

Updates yargs from 11.1.0 to 12.0.2

Changelog

Sourced from yargs's changelog.

12.0.2 (2018-09-04)

Bug Fixes

• middleware should work regardless of when method is called (664b265), closes #1178
• translation not working when using __ with a single parameter (#1183) (f449aea)
• upgrade os-locale to version that addresses license issue (#1195) (efc0970)

12.0.1 (2018-06-29)

12.0.0 (2018-06-26)

Bug Fixes

• .argv and .parse() now invoke identical code path (#1126) (f13ebf4)
• remove the trailing white spaces from the help output (#1090) (3f0746c)
• completion: Avoid default command and recommendations during completion (#1123) (036e7c5)

Chores

• test Node.js 6, 8 and 10 (#1160) (84f9d2b)
• upgrade to version of yargs-parser that does not populate value for unset boolean (#1104) (d4705f4)

Features

• add support for global middleware, useful for shared tasks like metrics (#1119) (9d71ac7)
• allow setting scriptName $0 (#1143) (a2f2eae)
• remove setPlaceholderKeys (#1105) (6ee2c82)

BREAKING CHANGES

• Options absent from argv (not set via CLI argument) are now absent from the parsed result object rather than being set with undefined
• drop Node 4 from testing matrix, such that we'll gradually start drifting away from supporting Node 4.
• yargs-parser does not populate 'false' when boolean flag is not passed
• tests that assert against help output will need to be updated

Commits

• 6c6c27d chore(release): 12.0.2
• 5928728 chore: explicit upgrade of insecure coveralls
• efc0970 fix: upgrade os-locale to version that addresses license issue (#1195)
• a9820b4 docs: fix typo in advanced.md (#1194)
• b39836f docs(advanced): fix typo (#1187)
• f449aea fix: translation not working when using __ with a single parameter (#1183)
• 664b265 fix: middleware should work regardless of when method is called
• 18b2fcb chore(release): 12.0.1
• cfa7c65 chore: explicit update of yargs-parser
• 6ab99fe chore: bump engines to Node.js 6.x (#1169)
• Additional commits viewable in compare view

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