fix semicolon in did parser

[chenyan-dfinity]

Fix #353

[github-actions]

Benchmark for c555139

Click to view benchmark

Test	Base	PR	%
Blob/&str	283.4±102.26µs	274.2±85.01µs	-3.25%
Blob/ByteBuf	231.6±59.83µs	229.9±56.11µs	-0.73%
Blob/Bytes	168.4±63.91µs	158.0±45.28µs	-6.18%
Blob/String	338.3±85.10µs	346.1±88.70µs	+2.31%
Collections/vec (text, nat)	87.1±4.24ms	90.5±3.25ms	+3.90%
Collections/vec int	41.9±1.70ms	42.9±1.73ms	+2.39%
Collections/vec int64	26.5±1.49ms	29.7±1.46ms	+12.08%
Collections/vec nat8	22.7±0.95ms	22.1±0.69ms	-2.64%
option list/1024	3.0±0.11ms	2.9±0.08ms	-3.33%
profiles/1024	6.1±0.37ms	5.6±0.17ms	-8.20%
variant list/1024	3.0±0.12ms	3.0±0.21ms	0.00%

[github-actions]

Benchmark for 36f6ec6

Click to view benchmark

Test	Base	PR	%
Blob/&str	273.7±84.66µs	272.2±83.63µs	-0.55%
Blob/ByteBuf	204.9±64.00µs	199.1±52.25µs	-2.83%
Blob/Bytes	127.7±38.16µs	129.7±37.00µs	+1.57%
Blob/String	302.3±94.68µs	303.4±96.88µs	+0.36%
Collections/vec (text, nat)	87.2±1.59ms	87.1±1.07ms	-0.11%
Collections/vec int	39.2±0.34ms	39.8±0.09ms	+1.53%
Collections/vec int64	26.8±0.33ms	28.0±1.69ms	+4.48%
Collections/vec nat8	20.4±0.18ms	20.6±0.11ms	+0.98%
option list/1024	2.7±0.01ms	2.7±0.02ms	0.00%
profiles/1024	5.3±0.03ms	5.3±0.06ms	0.00%
variant list/1024	2.7±0.04ms	2.7±0.02ms	0.00%