Implement memory updating for pre-3.4 kernels #410
Implement memory updating for pre-3.4 kernels
Since 3.4, `/proc/meminfo` contains a `MemAvailable` field, which polybar uses to determine `(gb|mb)_free` and `(gb|mb)_used`. This commit adds a fallback for when `MemAvailable` does not exist, allowing a fairly-accurate approximation on older kernels. This commit also removes the reliance on the exact order fields appear in `/proc/meminfo`.
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