manually add dependency on go-getter

vendor/github.com/ulikunitz/xz/lzma/examples/README.txt

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+These examples are taken from the draft LZMA specification as published.
+
+This is publishjed by 7-zip.org under
+
+http://www.7-zip.org/sdk.html

vendor/github.com/ulikunitz/xz/lzma/examples/a.txt

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+LZMA decoder test example
+=========================
+! LZMA ! Decoder ! TEST !
+=========================
+! TEST ! LZMA ! Decoder !
+=========================
+---- Test Line 1 -------- 
+=========================
+---- Test Line 2 -------- 
+=========================
+=== End of test file ==== 
+=========================

vendor/github.com/ulikunitz/xz/lzma/examples/info.txt

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+GOOD archives:
+
+a.lzma
+  the stream was compressed with default properties lp=0 lc=3 pb=2 and 64 KiB dictionary
+a_eos.lzma
+  the stream has EOS marker
+a_eos_and_size.lzma
+  the stream has EOS marker and unpack size is defined
+a_lp1_lc2_pb1.lzma
+  the stream was compressed with lp=1 lc=2 pb=1 properties
+
+
+BAD ARCHIVES:
+
+bad_corrupted.lzma
+  some bytes in compressed stream were changed
+bad_eos_incorrect_size.lzma
+  the stream has EOS marker and unpack size in header is larger than real uncompressed size
+bad_incorrect_size.lzma
+  the header contains incorrect size (290). The correct size is 327