add missing requirements for internal file pointers#1134

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mindplay-dk wants to merge 6 commits intophp-fig:masterfrom

mindplay-dk:stream-pointer-state

Commits on Jan 11, 2019

add missing requirements for internal file pointers
mindplay-dk
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Commits on Jan 13, 2019

add errata section
mindplay-dk
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Commits on Jan 30, 2019

add missing requirements for body-streams in generated Message instances; per feedback from Oscar Otero here https://groups.google.com/forum/#!topic/php-fig/mv9-MWDVVBM
mindplay-dk
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"body stream" -> `StreamInterface` instance
mindplay-dk
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Commits on Jan 31, 2019

`Interface()` -> `Interface`
mindplay-dk
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Commits on Feb 20, 2019

`createStreamFromFile()` should behave like `fopen()`
mindplay-dk
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