External document reference without a space between the hash and hashvalue fails

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External document references include a SHA1:[value]. Currently, the tag/value parser expects a space after the colon and before the value.

Per the spec, this space is not required.

Note that the regex pattern that needs to change is here:

spdx-java-tagvalue-store/src/main/java/org/spdx/tag/BuildDocument.java

Line 177 in 3f735fe

private static Pattern EXTERNAL_DOC_REF_PATTERN = Pattern.compile("(\\S+)\\s+(\\S+)\\s+SHA1:\\s+(\\S+)");

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This is related to the issue swinslow/cmake-spdx#8

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Resolved with PR #15